Biochemistry GD, Quiz & Formative PDF

11 0 4 BIOC HEMISTRY GD, QUIZ, & FORMATIVE Habiba Yehia BIO Group Discussion 1 Week 1: Amino Acids............................3 BIO Group Discussion 2 Week 1: Amino Acids............................5 BIO Group Discussion 3 Week 2: Conversion of Amino Acids....11 BI...

11 0 4 BIOC HEMISTRY GD, QUIZ, & FORMATIVE Habiba Yehia BIO Group Discussion 1 Week 1: Amino Acids............................3 BIO Group Discussion 2 Week 1: Amino Acids............................5 BIO Group Discussion 3 Week 2: Conversion of Amino Acids....11 BIO Group Discussion 4 Week 2: Conversion of Amino Acids....17 BIO Group Discussion 5 Week 3: Protein Chemistry..................19 BIO Pop Quiz 1 Week 3............................................................25 BIO Pop Quiz 2 Week 3............................................................26 BIO Pop Quiz 3 Week 3............................................................27 BIO Pop Quiz 4 Week 3............................................................28 BIO Formative 1........................................................................29 BIO Group Discussion 6 Week 4: Lipid Chemistry.....................32 BIO Group Discussion 7 Week 4: Lipids Revision.......................36 BIO Group Discussion 8 Week 4: Protein Revision....................41 BIO Group Discussion 9 Week 5: Carbohydrates......................46 BIO GROUP DISCUSSION 1 WEEK 1: AMINO ACIDS 1. The 5-year-old boy was referred to hospital for investigation of a persistent anemia, but on examination was found to have classical features of kwashiorkor. He was stunted with both height and weight below the fifth centile and had mild pitting oedema in both legs. His hair was pale and soft liver edge was palpable. Plasma albumin concentration was low and the plasma amino acid pattern, which revealed markedly reduced levels of essential but normal to high non-essential amino acids, was similar to that described in kwashiorkor in Uganda. A dietary history revealed that for about 2 years the child's diet had contained very little protein but adequate energy and had been supplemented with multivitamin pills. Enumerate the essential amino acids that was markedly reduced in this case? ANSWER: 2. A. A 2-year-old boy got his first meal of egg. He had sever allergic reaction; like eczema and sever skin itching. The case is diagnosed as sever allergic case. The patient’s condition would be categorized as belonging to food allergy. Answer the following questions as regard the previous case. Which of the following products could be elevated in the blood in this case? a) Arginine b) Tyrosine c) Glycine d) Histidine e) Histamine ANSWER: 2. B. This product was produced due to which of the following? a) Oxidation of histidine b) Reduction of arginine c) Carboxylation of histidine d) Decarboxylation of histidine e) Decarboxylation of histamine ANSWER: 2. C. What could you treat this case? a) Anti-arginine b) Anti-histamine c) Anti-glycine d) Anti-tyrosine e) Anti-histidine ANSWER: 3. Glutathione is a critical tripeptide involved in conjugation reactions and in reactions that protect cells from reactive oxygen species. Which of the following components compose glutathione? a) Glutamic acid, alanine, methionine b) Glutamine, alanine, cysteine c) Glutamate, glycine, cysteine d) Alanine, glycine, cysteine e) Methionine, glycine, cysteine ANSWER: BIO GROUP DISCUSSION 2 WEEK 1: AMINO ACIDS Choose: 1. Proteins contain a) Only α - amino acids b) Only β-amino acids c) Only essential Amino acids d) Only non-essential amino acids ANSWER: 2. The true statement about solutions of amino acids at physiological pH is a) All amino acids contain both positive and negative charges b) All amino acids contain positively charged side chains c) Some amino acids contain only positive charge d) All amino acids contain negatively charged side chains ANSWER: 3. Sulphur containing amino acid is a) Methionine b) Leucine c) Valine d) Asparagine ANSWER: 4. All the following are Sulphur containing amino acids found in proteins except a) Cysteine b) SAM c) Methionine d) Threonine ANSWER: 5. A basic amino acid is a) Lysine b) Tyrosine c) Valine d) Aspartic acid ANSWER: 6. Which one of the following is semi-essential amino acid for humans? a) Valine b) Arginine c) Lysine d) Tyrosine ANSWER: 7. An essential amino acid is a) Aspartate b) Tyrosine c) Methionine d) Serine ANSWER: 8. Non-essential amino acids a) Are not components of tissue proteins b) May be synthesized in the body from essential amino acids c) Have no role in the metabolism d) May be synthesized in the body in diseased states ANSWER: 9. Which one of the following is semi-essential amino acid for humans? a) Valine b) Arginine c) Lysine d) Tyrosine ANSWER: 10. An example of polar amino acid is a) Alanine b) Leucine c) Arginine d) Valine ANSWER: 11. The amino acid with a nonpolar side chain is a) Serine b) Valine c) Asparagine d) Threonine ANSWER: 12. Branched chain amino acids include: a) Glutamine, aspargine, valine. b) Valine, leucine, threonine. c) Leucine, isoleucine, valine. d) Valine, isoleucine, methionine. e) Valine, serine, methionine. ANSWER: 13. An amino acid having a hydrophilic side chain is a) Alanine b) Proline c) Methionine d) Serine ANSWER: 14. Two amino groups are present in a) Leucine b) Glutamate c) Lysine d) Threonine ANSWER: 15. All the following are branched chain amino acids except a) Isoleucine b) Alanine c) Leucine d) Valine ANSWER: 16. An –OH group is present in the side chain of a) Serine b) Arginine c) Lysine d) Proline ANSWER: 17. Sulphur-containing amino acid is a) Glutathione b) Chondroitin sulphate c) Methionine d) Tryptophan ANSWER: 18. Which among the following is an essential amino acid? a) Cysteine b) Leucine c) Tyrosine d) Aspartic acid ANSWER: Enumerate: 1.Essential basic amino acids in growing child 2.Aromatic hydrophobic amino aids 3.Hydrophilic essential amino acids 4.Aromatic essential amino acids 5.Amino acids derived from acidic amino acids 6.Neutral hydrophilic amino acid 7.One branched chain amino acid and one aromatic non essential amino acid BIO GROUP DISCUSSION 3 WEEK 2: CONVERSION OF AMINO ACIDS Choose: 1.The amino acid which synthesizes many hormones: a) Valine b) Phenylalanine c) Alanine d) Histidine ANSWER: 2. Glutathione is a) Oxidants b) synthesized from essential amino acid c) should be taken in diet d) antioxidants ANSWER: 3. Protein is a polymer of a) Sugars b) Phenols c) Amino acids d) Carboxylic acids ANSWER: 4. All the following statements about phenylketonuria are correct except a) Phenylalanine cannot be converted into tyrosine b) Urinary excretion of phenylpyruvate and phenyllactate is increased c) It can be controlled by giving a low phenylalanine diet and low tyrosine diet. d) It leads to decreased synthesis of thyroid hormones, catecholamines and melanin ANSWER: 5. All the following statements about albinism are correct except a) Tyrosine hydroxylase (tyrosinase) is absent or de cient in melanocytes b) Skin is hypopigmented c) It results in mental retardation d) Eyes are hypopigmented ANSWER: 6. Primary structure of a protein is stabilized by a) Hydrogen bonds b) Peptide bonds c) Disulphide bonds d) All of these ANSWER: 7. α-Helix is stabilized by a) Hydrogen bonds b) Hydrophobic bonds c) Electrostatic bonds fi d) Disulphide bonds ANSWER: 8. Serotonin is derived in the body from the following amino acid: a) Phenylalanine b) Histidine c) Tryptophan d) Serine ANSWER: 9. Infantile convulsions due to lesser formation of gamma amino butyric acid is seen in the de ciency of a) Basic amino acid b) Essential amino acid c) Hydrophobic amino acid d) Hydrophilic amino acid ANSWER: 10. DOPA is an intermediate in the synthesis of a) Thyroid hormones b) Catecholamines c) Melanin d) Catecholamines and melanin ANSWER: 11. Serotonin is synthesized from a) Serine fi b) Phenylalanine c) Tyrosine d) Tryptophan ANSWER: 12. GABA (gama amino butyric acid) is a) CNS excitatory transmitter b) CNS inhibitor transmitter c) Synthesized from basic amino acid d) Synthesized from all amino acids ANSWER: 13. Positive nitrogen balance is seen in a) Starvation b) Chronic infections c) Growing age d) Intestinal malabsorption ANSWER: 14. Glycine is not required for the formation of a) Collagen b) Creatine c) Purines d) Uracil ANSWER: Complete with a Very Short Answer: 1. Tryptophan could be considered as precursor of________________________________________________ 2. Hydroxylation of phenylalanine requires an enzyme named_________ __________________________________________ 3. Functions of tyrosine are: __________________________________________ 4. Glutathione functions are:________ 5. Glutathione is synthesized from______________________ 6. Creatine is synthesized from _______________ amino acid, present in ________ of the body and functioning as__________________________ 7. Histamine is product of decarboxylation of __________ amino acid and it was increased in ___________________ reactions in the body. Short essay: On biochemical basis explain: 1.Serotonin can be used as antidepressant _____________________________________________________________________ _______________________________________________________ 2.Lysine chemical structure is suitable for DNA epigenetic regulation _____________________________________________________________________ ________________________________________________________ 3.Glutamic acid is essential of convulsions treatment _____________________________________________________________________ _______________________________________________________ 4.Glycine is used in anemia treatment _____________________________________________________________________ _______________________________________________________ 5. The relation between uncontrolled diabetes and nitrogen balance ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ BIO GROUP DISCUSSION 4 WEEK 2: CONVERSION OF AMINO ACIDS Choose: 1. Skin color is the result of the expression of a number of genes and genetic inheritance. Hypopigmentation may be caused by which of the following? a) Excess formation of melanin b) Excess tyrosine that can’t be converted to melanin in the tissues c) Hyposecretion of melatonin d) Excessive stimulation of tyrosinase e) Low levels of para-hydroxyphenylpyruvate ANSWER: 2. As part of a standard neonatal screen, an infant is diagnosed with a loss of function genetic defect in the enzyme phenylalanine hydroxylase. Defects in this enzyme can result in a condition known as phenylketonuria (PKU), which results from the toxic effects of phenylalanine derived phenylketones. Fortunately, this condition can be managed by regulating the amount of phenylalanine provided in the diet. Which of the following nonessential amino acids will need to be supplied in the diet of this infant? a) Asparagine b) Glutamine c) Methionine d) Proline e) Tyrosine ANSWER: 3. An 83-year-old man is brought to the physician because of diarrhea and vomiting for the past month. He is unable to give a clear history, but his daughter reports that he has been “quite sad” lately and often seems very confused. His diet consists of dried cereal and maize; he never eats milk or eggs. Physical examination shows sharply demarcated plaques on his hands, feet, and around his neck. Which of the following amino acids can substitute for a portion of the Niacin vitamin deficient in this patient? a) Alanine b) Asparagine c) Methionine d) Proline e) Tryptophan ANSWER: BIO GROUP DISCUSSION 5 WEEK 3: PROTEIN C HEMISTRY 1. A 20-years old pregnant advised to avoid any areas had ultraviolet rays. Explain why? ANSWER: 2. A 37-year-old female presents to your clinic to discuss her plans for a new vegetarian diet. The patient heard from a friend about a new vegetarian diet that promised rapid weight loss. The diet consists of many leafy vegetables with no pork, chicken, beef, eggs, or milk. She is also planning on working out regularly with the goal of running a marathon within the year. After listening to the patient, you refer her to a nutritionist for further assistance and guidance. A. What is an essential amino acid, and how many are there? B. List the essential amino acids.? ANSWER A.: ANSWER B.: 3. A. A young child is in an automobile accident that requires surgical intervention and substantial recovery time in the hospital. A consultation with a nutritionist results in a specific dietary plan. The plan included the supplementation of an amino acid that is typically considered a nonessential amino acid. Which of the following amino acids is an essential amino acid under conditions of enhanced growth or surgical recovery? a) Alanine b) Arginine c) Glycine d) Serine e) Tyrosine ANSWER: 3. B. Giving the child his adequate nutritional needs by food and supplements would put him in a state of…………nitrogen balance a) Negative b) Positive c) Balanced ANSWER: 4. Which one of the following statements concerning protein structure is correct? a) Proteins consisting of one polypeptide have quaternary structure that is stabilized by covalent bonds. b) The peptide bonds that link amino acids in a protein most commonly occur in the quaternary structure. c) The formation of a disulfide bond in the primary structure of the protein requires the cysteine amino acids. d) The denaturation of proteins leads to irreversible loss of secondary structural elements such as the α-helix. e) The driving force for protein folding is the hydrophobic effect. ANSWER: 5. In proteins the α-helix and β-pleated sheet are examples of a) Primary structure b) Secondary structure c) Tertiary structure d) Quaternary structure ANSWER: 6. The a-helix of proteins is a) A pleated structure b) Made by disulphide bridges c) A non-folded structure d) Stabilized by hydrogen bonds between NH and CO groups of the main chain ANSWER: 7. Tertiary structure of a protein describes a) The order of amino acid b) Location of disulphide bonds c) pleated regions of proteins d) The ways of packing for folded protein ANSWER: 8. Primary structure of a protein is formed by a) Hydrogen bonds b) Peptide bonds c) Disulphide bonds d) All of these ANSWER: 9. α-Helix is formed by a) Hydrogen bonds b) Hydrophobic bonds c) Electrostatic bonds d) Disulphide bonds ANSWER: 10. Denaturation of proteins results in a) Disruption of primary structure b) Breakdown of peptide bonds c) Destruction of hydrogen bonds d) Irreversible changes in the molecule ANSWER: 11. Two amino groups are present in a) Leucine b) Glutamate c) Lysine d) Threonine ANSWER: 12. During denaturation of proteins, all of the following are disrupted except a) Primary structure b) Secondary structure c) Tertiary structure d) Quaternary structure ANSWER: 13. All the following are branched chain amino acids except a) Isoleucine b) Alanine c) Leucine d) Valine ANSWER: 14. An –OH group is present in the side chain of a) Serine b) Arginine c) Lysine d) Proline ANSWER: 15. Folding of newly synthesized proteins is accelerated by a) Protein disulphide isomerase b) Prolyl cis-trans isomerase c) Chaperonins d) All of these ANSWER: 16. Skin color is the aggregate result of the expression of a number of genes modified by ethnic origin and genetic inheritance. Hypopigmentation may be caused by which of the following? a) Excess formation of melanin b) Excess phenylalanine in the serum and tissues c) Hyposecretion of melatonin d) Excessive stimulation of tyrosinase e) Low levels of para-hydroxyphenylpyruvate ANSWER: 17. A 1-year-old girl is brought to her pediatrician’s office with concerns about her development. She had an uncomplicated birth outside the United States at term. The mother reports that the baby is not achieving the normal milestones for a baby of her age. She also reports an unusual odor to her urine and some areas of hypopigmentation on her skin and hair. On exam, the girl is noted to have some muscle hypotonia and microcephaly. The urine collected is found to have a “mousy” odor. A. What is the most likely diagnosis? B. What is the biochemical basis of the hypopigmented skin and hair?. ANSWER A.: ANSWER B.: 18. A. An 80-year-old man presented with impairment of higher intellectual function and alterations in mood and behavior. His family reported progressive disorientation and memory loss over the last 6 months. There is no family history of dementia. The patient was diagnosed with Alzheimer disease. Which one of the following best describes Alzheimer disease? a) It is associated with an abnormal protein with an altered amino acid sequence. b) It results from accumulation of denatured proteins that have random conformations. c) It is associated with the accumulation of non toxic protein. d) It is associated with the deposition of neurotoxic peptide aggregates. e) It is a disease influenced by the genetics of the individual. ANSWER: 18. B. Explain how can we prevent the progress of this Alzheimer Disease? ANSWER:  BIO POP QUIZ 1 WEEK 3 Complete the Missing Parts: 1. The primary structure of the protein is maintained by__________ ______________________________________________ 2. The primary structure of the protein is_________________of the amino acids in speci c sequence. 3. The secondary structure of the protein is maintained by ________________________________________ 4. The secondary structure of the protein is_____________________into α-chain or β-pleated sheets. 5. Lipoproteins chemical nature is__________________ fi  BIO POP QUIZ 2 WEEK 3 Complete the Missing Parts: 1. The tertiary and quaternary structure of the protein are maintained by______________________________________ 2. The tertiary structure of the protein is_________of the polypeptide chain into globular structure. 3. The quaternary structure of the protein is _____________________between di erent polypeptide chains. 4. The chemical nature of immunoglobulin is_____________________________. 5. Hydrolytic products of milk casein is_________________ ff  BIO POP QUIZ 3 WEEK 3 Complete the Missing Parts: 1. Phenylalanine chemical nature is______________________________________ 2. Glutathione function is__________________________________. 3. PKU is caused by ________________________________. 4. The chemical nature of collagen is_________________. 5. Hydrolytic products of glycoprotein are__________________  BIO POP QUIZ 4 WEEK 3 Complete the Missing Parts: 1. Glutamic acid chemical nature is_____________________________ 2. Glycine function is_____________________________________. 3. Albinism is caused by ________________________. 4. The chemical nature of albumin is_________________. 5. Hydrolytic products of lipoproteins are_________________  BIO FORMATIVE 1 1. Which one of the following is essential hydrophobic amino acid for humans? a) Lysine b) Threonine c) Valine d) Arginine ANSWER: 2. Two amino groups are present in a) Threonine b) Glutamate c) Leucine d) Lysine ANSWER: 3. Sulphur- donor containing amino acid is a) Methionine b) Cystine c) Chondroitin sulphate d) Glutathione ANSWER: 4. Glutathione is synthesized from essential amino acid a) True b) False ANSWER: 5. Primary structure of a protein is stabilized by Peptide bonds a) True b) False ANSWER: 6. Infantile convulsions due to lesser formation of gamma amino butyric acid is seen in the deficiency of Hydrophilic amino acid a) True b) False ANSWER: 7. DOPA is an intermediate in the synthesis of Thyroid hormones a) True b) False ANSWER: 8. Glycine is not required for the formation of a) Purines b) Uracil c) Creatine d) Collagen ANSWER: 9. During denaturation of proteins, all of the following are disrupted except a) Quaternary structure b) Primary structure c) Secondary structure d) Tertiary structure ANSWER: 10. It is a globular protein , which carries fatty acids, bile pigments, steroids, hormones, and drugs in blood. a) Albumin b) Keratin c) Collagen d) Scleroprotein ANSWER: BIO GROUP DISCUSSION 6 WEEK 4: LIPID C HEMISTRY Choose: 1. An example of a saturated fatty acid is a) Palmitic acid b) Oleic acid c) Linoleic acid d) Erucic acid ANSWER: 2. If the fatty acid is esterified with an alcohol of high molecular weight instead of glycerol, the resulting compound is a) Lipositol b) Plasmalogen c) Wax d) Cephalin ANSWER: 3. A fatty acid which isn’t synthesized in the body and has to be supplied in the diet is a) Palmitic acid b) Lauric acid c) Linolenic acid d) Palmitoleic acid ANSWER: 4. Essential Fatty Acid a) Linoleic acid b) Linolenic acid c) Arachidonic acid d) All of the above ANSWER: 5. Free fatty acids are transported in the blood a) Combined with albumin b) Combined with fatty acid binding protein c) Combined with β-lipoprotein d) In unbound free salts ANSWER: 6. In mammals, the major fat in adipose tissues is a) Phospholipid b) Cholesterol c) Sphingolipids d) Triacylglycerol ANSWER: 7. Triglycerides are a) Soluble in water b) Major constituents of membranes c) Non-polar d) Hydrophilic ANSWER: 8. Which of the following is a polyunsaturated fatty acid? a) Palmitic acid b) Palmitoleic acid c) Linoleic acid d) Oleic acid ANSWER: 9. Which of the following can be synthesized in the human body if precursors are available? a) Oleic acid b) Palmitoleic acid c) Arachidonic acid d) All of the above ANSWER: 10. Fatty liver may be caused by a) Deficiency of PUFA b) High PUFA c) Deficiency of TAG d) All of the above ANSWER: 11. Which of the following are classified as essential fatty acids? a) Arachidonic acid b) Oleic acid c) Acetic acid d) Butyric acid ANSWER: 12. Neutral fat is stored in a) Liver b) Pancreas c) Adipose tissue d) Brain ANSWER: BIO GROUP DISCUSSION 7 WEEK 4: LIPIDS REVISION Choose: 1. All of the following are saturated fatty acids except: a) Acetic acid b) Butyric acid c) Linoleic acid d) Palmitic acid ANSWER: 2. PUFA include all of the following except: a) Linoleic acid b) Arachidonic acid c) Linolenic acid d) Stearic acid ANSWER: 3. All of the following is conjugated lipid except: a) Lecithin b) Cephalin c) Bees wax d) Cerebroside ANSWER:  4. All of the following lipids contain glycerol except: a) Lecithin b) Bees wax c) Cephalin d) Phosphatidylserine ANSWER: 5. All of the following contain sphingosine except: a) Sphingomyelin b) Cerebroside c) Ganglioside d) Lecithin ANSWER: 6. All of the following are steroid hormones except: a) Estrogen b) Insulin c) Aldosterone d) Cortisol ANSWER: De ne & Give Examples: 1. Essential Fatty Acids. ANSWER: fi 2. Simple lipids ANSWER: Enumerate: 1. Deficiency manifestations of essential fatty acids in infants. ANSWER: 2. Deficiency manifestations of essential fatty acids in adults. ANSWER: 3. Two lipids containing glycerol ANSWER: 4. One phospholipid contain sphingosine ANSWER: 5. Male sex hormone ANSWER: 6. Female sex hormone. ANSWER: 7. Glucocorticoids ANSWER: 8. Mineralocorticoids ANSWER: What is the hydrolytic product of: 1. Neutral fat (TAG) ANSWER: 2. Oil ANSWER: 3. Wax ANSWER: 4. Lecithin ANSWER: 5. Sphingomyelin ANSWER: 6. Cerebroside ANSWER: What is the chemical nature of: 1. Bees wax ANSWER: 2. Linoleic acid ANSWER: 3. Acetic acid ANSWER: 4. TAG ANSWER: 5. Cholesterol ANSWER: 6. Lecithin ANSWER: 7. Spingomyelin ANSWER: 8. Sulpholipids ANSWER: On biochemical basis explain: 1.Phospholipids are bilayer arranged in cell membrane ANSWER: 2.Phospholipids are forming micelles in water ANSWER: 3.Phospholipids prevent biliary cholesterol stones ANSWER: 4.Phospholipids act as an emulsifying factor ANSWER: 5.Lung surfactant de ciency causes respiratory distress syndrome ANSWER: 6.Cholesterol help bone calci cation indirectly. ANSWER: fi fi BIO GROUP DISCUSSION 8 WEEK 4: PROTEIN REVISION Choose: 1. All of the following are aliphatic amino acid except: a) Alanine b) Phenylalanine c) Threonine d) Serine ANSWER: 2. All of the following are branched chain amino acids except: a) Valine b) Leucine c) Lysine d) Isoleucine ANSWER: 3. All of the following are amino acids that contain hydroxyl group except: a) Threonine b) Serine c) Tyrosine d) Lysine ANSWER: 4. One of the following amino acids contain sulfur a) Glycine b) Serine c) Cysteine d) Tryptophan ANSWER: 5. One of the following is a basic amino acid a) Histidine b) Alanine c) Leucine d) Valine ANSWER: 6. One of the following is an essential amino acid a) Alanine b) Methionine c) Lysine d) B & C ANSWER: 7. The semi-essential amino acids are a) Alanine and Lysine b) Tyrosine and Tryptophan c) Arginine and Histidine d) Alanine and Histidine ANSWER:  8. All of the following bonds stabilize the tertiary structure except: a) Peptide bond b) Hydrogen bond c) Disulfide bond d) Ionic bond ANSWER: 9. One of the following is a simple protein a) Hemoglobin b) Keratin c) Casein d) Immunoglobulin ANSWER: 10. NHI include a) Ferritin b) Hemoglobin c) Myolobin d) Kinases ANSWER: De ne & Give Examples: 1. Essential Amino Acids. ANSWER: fi 2. Semi-essential amino acids ANSWER: 3. Non-essential amino acids ANSWER: 4. Primary Structure of Protein ANSWER: Enumerate: 1. Two essential amino acids ANSWER: 2. Two non essential amino acids ANSWER: 3. Semi essential amino acid ANSWER: 4. Two NHI ANSWER: 5. Two phosphoproteins ANSWER: 6. Two hemoproteins ANSWER: Give an account on 1.Denaturation (de ne, factors, e ects) ANSWER: 2.Biological importance of proteins fi ff ANSWER: 3.Protein structure ANSWER: Compare between 1.Hemoglobin and myoglobin ANSWER: What is the hydrolytic product of: 1. Casein ANSWER: 2. Collagen ANSWER: 3. Ferritin ANSWER: What is the chemical nature of: 1. Casein ANSWER: 2. Collagen ANSWER: 3. Transferrin ANSWER: BIO GROUP DISCUSSION 9 WEEK 5: C ARBOHYDRATES Choose: 1. Ribose and xylose are a) Aldoses b) Ketoses c) Pentoses d) A and C ANSWER: 2. α and β forms of D-glucose are a) Disaccharides b) Polysaccharides c) Anomers d) Mirror image isomers ANSWER: 3. A pentose sugar is a) Dihydroxyacetone b) Ribulose c) Erthyrose d) Glucose ANSWER: 4. All of the following are monosaccharide derivate except a) Sorbitol b) Glucuronic acid c) Dihydroxyacetone d) Glycerol ANSWER: 5. Glycerol is a a) Glycoside b) Deoxysugar c) Sugar alcohol d) Protein ANSWER: 6. All of the choices are right regarding the glucose except a) It is an aldohexose b) It is a disaccharide c) It has an asymmetric carbon atom d) It has mirror image isomers ANSWER: 7. 8- Glucuronic acid is characterized by all the following except: a) It is a sugar acid b) Derived from glucose c) By hydrolysis gives glucose d) Enters in GAGs formation ANSWER: 8. Galactose amine is a a) Disaccharide b) Amino sugar c) Derived from galactose d) B and C ANSWER: 9. Ascorbic acid is a) Sugar acid b) Derived from glucose oxidation c) Synthesized in human body d) A and B ANSWER: 10. The aldose sugar is a) Glycerol b) Ribulose c) Erythulose d) Dihydroxyacetone ANSWER: 11. A triose sugar is a) Glycerol b) Ribose c) Erythrose d) Fructose ANSWER: 12. A pentose sugar is a) Dihydroxyacetone b) Ribulose c) Erythrose d) Glucose ANSWER: 13. α-D-glucose and β-D-glucose are a) Stereosiomers b) Epimers c) Anomers d) Keto-aldo pairs ANSWER: 14. A sugar alcohol is a) Mannitol b) Trehalose c) Xylulose d) Arabinose ANSWER: 15. Ribulose is a a) Ketotetrose b) Alsotetrose c) Ketopentose d) Aldopentose ANSWER: 16. The carbon atom which becomes asymmetric when the straight chain form of monosaccharide changes into ring form is known as a) Anomeric carbon atom b) Epimeric carbon atom c) Isomeric carbon atom d) None of the above ANSWER: 17. Which of the following is an epimeric pair? a) Glucose and fructose b) Glucose and galactose c) Galactose and mannose d) Lactose and maltose ANSWER: Enumerate: 1. 2 sugar alcohols one from aldoses and the other from ketoses ANSWER: 2. Sugar acids ANSWER: 3. 2 aminosugars ANSWER: 4. 2 trioses and 2 pentoses ANSWER: 5. 2 aldose-ketose isomers ANSWER: 6. Sugar alcohols ANSWER: What is the chemical nature of: 1. Glucose ANSWER: 2. Fructose ANSWER: 3. Dihydroxyacetone ANSWER: On biochemical basis explain 1. All monosaccharides has a reducing ability for Benedict reagent. ANSWER: Answer the following according to the below chemical formula: 1. What is the name of this biomolecule? ANSWER: 2. What is the chemical nature of this biomolecule? ANSWER: 3. What is the function of this biomolecule? ANSWER: 4. This biomolecule is derived from ANSWER: