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Questions and Answers
What type of dextrin is categorized as straight unbranched and gives a blue color with iodine?
What type of dextrin is categorized as straight unbranched and gives a blue color with iodine?
Which of the following is true about cellulose?
Which of the following is true about cellulose?
What is a characteristic of agar in microbiology?
What is a characteristic of agar in microbiology?
Which type of dextrin is colorless and similar to amylo-dextrin but smaller?
Which type of dextrin is colorless and similar to amylo-dextrin but smaller?
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What is the main function of inulin in the body?
What is the main function of inulin in the body?
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What kind of bonds link the repeated units of fructose in inulin?
What kind of bonds link the repeated units of fructose in inulin?
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Which factor differentiates limit dextrin from other dextrins?
Which factor differentiates limit dextrin from other dextrins?
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What similarity does dextrins have with starch?
What similarity does dextrins have with starch?
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What distinguishes aldoses from ketoses?
What distinguishes aldoses from ketoses?
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Which of the following substances are categorized as aldotrioses?
Which of the following substances are categorized as aldotrioses?
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What is the significance of erythrose in biological processes?
What is the significance of erythrose in biological processes?
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What defines a pentose in terms of its carbon atom composition?
What defines a pentose in terms of its carbon atom composition?
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Which of the following is a characteristic of ribose?
Which of the following is a characteristic of ribose?
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Which of the following correctly identifies a ketohexose?
Which of the following correctly identifies a ketohexose?
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What condition occurs when large amounts of arabinose are ingested?
What condition occurs when large amounts of arabinose are ingested?
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Which of the following statements about hexoses is true?
Which of the following statements about hexoses is true?
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Which amino sugar is a component of chondroitin sulphate?
Which amino sugar is a component of chondroitin sulphate?
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What is the structure of muramic acid primarily composed of?
What is the structure of muramic acid primarily composed of?
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What is the significance of invert sugar in honey?
What is the significance of invert sugar in honey?
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How do amino sugars contribute to the function of certain antibiotics?
How do amino sugars contribute to the function of certain antibiotics?
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Which glycoside is known to contain an aglycone that is a steroid?
Which glycoside is known to contain an aglycone that is a steroid?
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What is the primary role of sucrase (invertase) in relation to sugars?
What is the primary role of sucrase (invertase) in relation to sugars?
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What is the consequence of introducing sucrose parenterally?
What is the consequence of introducing sucrose parenterally?
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Which amino sugar is specifically related to neuraminic acid?
Which amino sugar is specifically related to neuraminic acid?
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What is primarily responsible for the occurrence of diarrhea when disaccharides are not hydrolyzed in the gut?
What is primarily responsible for the occurrence of diarrhea when disaccharides are not hydrolyzed in the gut?
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Which of the following best describes homopolysaccharides?
Which of the following best describes homopolysaccharides?
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Starch is composed of which two polymeric units of glucose?
Starch is composed of which two polymeric units of glucose?
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What is the process called that converts glucose into glycogen?
What is the process called that converts glucose into glycogen?
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During postmortem, at what pH does glycogenolysis cease due to lactic acid formation?
During postmortem, at what pH does glycogenolysis cease due to lactic acid formation?
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Which monosaccharide is primarily synthesized in the mammary gland to produce lactose?
Which monosaccharide is primarily synthesized in the mammary gland to produce lactose?
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Which of the following correctly defines dextrins?
Which of the following correctly defines dextrins?
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What type of sugar is formed if the remaining —OH group is on the left side during the cyclic reaction?
What type of sugar is formed if the remaining —OH group is on the left side during the cyclic reaction?
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Where is glycogen primarily stored in higher animals?
Where is glycogen primarily stored in higher animals?
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What distinguishes a sugar that has an asymmetric carbon atom?
What distinguishes a sugar that has an asymmetric carbon atom?
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What type of polysaccharide denotes carbohydrates with additional molecular groups, such as hexuronic acid?
What type of polysaccharide denotes carbohydrates with additional molecular groups, such as hexuronic acid?
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Which monosaccharide is commonly found in seminal fluid and provides energy for sperm?
Which monosaccharide is commonly found in seminal fluid and provides energy for sperm?
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Which cyclic form corresponds to a 5-carbon ring structure?
Which cyclic form corresponds to a 5-carbon ring structure?
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Which of the following carbohydrates is formed from glucose in the liver?
Which of the following carbohydrates is formed from glucose in the liver?
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A compound that can rotate plane polarized light either to the right or to the left exhibits what property?
A compound that can rotate plane polarized light either to the right or to the left exhibits what property?
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Which monosaccharide does NOT occur freely in nature?
Which monosaccharide does NOT occur freely in nature?
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Which type of isomerism pertains to compounds with the same molecular formula but different functional groups?
Which type of isomerism pertains to compounds with the same molecular formula but different functional groups?
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What distinguishes an anomer from regular stereoisomers?
What distinguishes an anomer from regular stereoisomers?
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Which monosaccharide is known to be dextrorotatory and is often referred to as dextrose?
Which monosaccharide is known to be dextrorotatory and is often referred to as dextrose?
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Which of the following statements about epimers is correct?
Which of the following statements about epimers is correct?
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How many asymmetric carbon atoms are present in fructose?
How many asymmetric carbon atoms are present in fructose?
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Which sugar is considered a deoxy sugar and is a component of nucleic acids?
Which sugar is considered a deoxy sugar and is a component of nucleic acids?
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Which of the following molecules is an enantiomer of glyceraldehyde?
Which of the following molecules is an enantiomer of glyceraldehyde?
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Alpha and beta forms of glucose are examples of what type of isomers?
Alpha and beta forms of glucose are examples of what type of isomers?
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Flashcards
What are trioses?
What are trioses?
Monosaccharides with three carbon atoms.
What is an aldotriose?
What is an aldotriose?
A triose with an aldehyde group.
What is a ketotriose?
What is a ketotriose?
A triose with a ketone group.
What are tetroses?
What are tetroses?
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What is an aldotetrose?
What is an aldotetrose?
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What is a ketotetrose?
What is a ketotetrose?
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What are pentoses?
What are pentoses?
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What is an aldopentose?
What is an aldopentose?
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Enantiomers
Enantiomers
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Glyceraldehyde
Glyceraldehyde
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Anomeric Carbon
Anomeric Carbon
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Anomers
Anomers
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Aldose-Ketose Isomerism
Aldose-Ketose Isomerism
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Epimers
Epimers
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Deoxy Sugars
Deoxy Sugars
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Dextrorotatory
Dextrorotatory
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Amino Sugars
Amino Sugars
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Glucosamine
Glucosamine
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Galactosamine
Galactosamine
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Mannosamine
Mannosamine
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Muramic Acid
Muramic Acid
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Glycosides
Glycosides
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Invert Sugar
Invert Sugar
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Sucrase (Invertase)
Sucrase (Invertase)
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Glucose: Primary Energy Source
Glucose: Primary Energy Source
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Glucose Metabolism in the Liver
Glucose Metabolism in the Liver
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Fructose: The Fruit Sugar
Fructose: The Fruit Sugar
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Galactose: Milk Sugar
Galactose: Milk Sugar
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Mannose: A Glycoprotein Component
Mannose: A Glycoprotein Component
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Cyclic Sugars: Furanose and Pyranose
Cyclic Sugars: Furanose and Pyranose
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Alpha (α) and Beta (β) Sugars
Alpha (α) and Beta (β) Sugars
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Asymmetric Carbon in Sugars
Asymmetric Carbon in Sugars
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What are polysaccharides?
What are polysaccharides?
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What are homopolysaccharides?
What are homopolysaccharides?
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What are heteropolysaccharides?
What are heteropolysaccharides?
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What is starch?
What is starch?
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What are amylose and amylopectin?
What are amylose and amylopectin?
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What is glycogen?
What is glycogen?
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What are glycogenesis and glycogenolysis?
What are glycogenesis and glycogenolysis?
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What are dextrins?
What are dextrins?
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Dextrins
Dextrins
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Types of Dextrins: Amylodextrin, Erythrodextrin, Achrodextrin
Types of Dextrins: Amylodextrin, Erythrodextrin, Achrodextrin
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Limit Dextrin
Limit Dextrin
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Cellulose
Cellulose
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Agar
Agar
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Inulin
Inulin
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Study Notes
Carbohydrate Chemistry
- Carbohydrates are defined chemically as aldehyde or ketone derivatives of higher polyhydric alcohols, or compounds that yield these derivatives upon hydrolysis.
- Carbohydrates are a primary energy source.
- Carbohydrates are components of compound lipids and conjugated proteins.
- Degradation products of carbohydrates act as catalysts.
- Some carbohydrate derivatives serve as drugs (e.g., cardiac glycosides, antibiotics).
- Lactose is the primary milk sugar in lactating mammary glands.
- Degradation products are used in synthesizing other substances (e.g., fatty acids, cholesterol, amino acids).
- Carbohydrates are components of mucopolysaccharides, which form the ground substance of mesenchymal tissues.
- Inherited deficiencies in carbohydrate metabolism enzymes can cause diseases (e.g., galactosemia, glycogen storage diseases, lactose intolerance).
- Disruptions in glucose metabolism are linked to diabetes mellitus.
Carbohydrate Classification
- Carbohydrates are categorized into four major groups: monosaccharides, disaccharides, oligosaccharides, and polysaccharides.
- Monosaccharides contain one sugar unit, and cannot be further hydrolyzed.
- Subdivided based on the number of carbon atoms (e.g., trioses, tetroses, pentoses, hexoses).
- Further subdivided into aldoses (aldehyde group) and ketoses (ketone group).
- Examples include: - Triose: Glyceraldehyde, Dihydroxyacetone - Tetroses: Erythrose, Erythrulose - Pentoses: Ribose, arabinose, lyxose, xylose - Hexoses: Glucose, mannose, galactose, fructose
- Disaccharides contain two sugar units.
- Oligosaccharides contain 3–10 sugar units.
- Polysaccharides contain more than 10 sugar units.
Monosaccharides
- Monosaccharides (also called simple sugars or glycoses) cannot be further hydrolyzed into simpler forms.
- They can be further classified according to the number of carbon atoms (trioses, tetroses, pentoses, hexoses, etc) and by the presence of an aldehyde or ketone group (aldoses or ketoses).
- Specific monosaccharides, such as ribose, have important roles in the structure of nucleic acids (RNA and DNA), ATP, GTP, and coenzymes NAD and FAD.
- Arabinose is found in fruits. Ingesting large quantities can cause arabinose to appear in urine.
- Lyxose is a human heart muscle constituent.
- The classification of monosaccharides are based on the number of carbon atoms.
- Hexoses are six-carbon monosaccharides including Glucose, mannose, galactose and fructose. Glucose is the major energy source in mammals and fetus.
Cyclic Structures of Monosaccharides
- Monosaccharides exist primarily in cyclic forms produced by the reaction between the carbonyl group and an alcohol group.
- Furanose structures have a four-membered ring.
- Pyranose structures have a five-membered ring.
- Different arrangements around the hemiacetal or hemiketal carbons(α or β) produce anomers.
- α and β designations are made based on the position of the hydroxyl group attached to the anomeric carbon in the ring structure.
- Asymmetric carbons exist in the monosaccharides and this gives rise to the optical activity and isomers.
Properties of Monosaccharides
- Optical activity - Monosaccharides can rotate polarized light either to the left (levo) or right (dextro).
- Optical isomerism - Several forms of the same monosaccharide can be mirror images (e.g., D- and L- forms of glyceraldehyde).
Important Monosaccharides and Derivatives
- Deoxy sugars- One or more oxygen atoms have been replaced with hydrogen. Example: Deoxyribose (a component of DNA)
- Amino sugars: Monosaccharides containing an amino group (-NH2) . Example: Glucosamine, Galactosamine, Mannosamine.
- Neuraminic acid (or Sialic acids)- A derivative of an amino sugar containing an acidic group and linked to other components. The presence of N-acetyl group makes them stable.
- Glycosides: Contains a carbohydrate and a non-carbohydrate residue linked. Example: Cardiac glycosides like Digitalis (used in heart conditions).
Disaccharides
- Disaccharides contain two monosaccharide units linked together by a glycosidic bond.
- Common Disaccharides: Maltose, Isomaltose, Trehalose, Lactose and Sucrose
- Invert sugar is a mixture of glucose and fructose synthesized by the hydrolysis of sucrose in the presence of sucrase enzyme.
Polysaccharides
- Polysaccharides are polymers of monosaccharides.
- Homopolysaccharides contain only one type of monosaccharide unit. Examples include: Starch, Glycogen, Cellulose, Agar, Inulin.
- Heteropolysaccharides contain more than one type of monosaccharide unit; examples include: Mucopolysaccharides.
Starch
- Starch is a storage carbohydrate in plants, composed of amylose and amylopectin.
- Amylose is a linear polymer of glucose units.
- Amylopectin is a branched polymer of glucose units.
- Starch can be broken down into dextrins through partial hydrolysis by acids or enzymes..
Glycogen
- Glycogen is the storage form of carbohydrates in animals, similar to starch in structure but more branched.
Dextrins
- Dextrins are products of starch partial hydrolysis, and have lower molecular weights.
- Various types of dextrins exist, based on the degree of hydrolysis.
Cellulose
- Cellulose is a structural carbohydrate in plants, composed of long chains of glucose units linked by β(1 → 4) glycosidic bonds.
- It is indigestible by humans due to the lack of enzymes to break down the β-linkages.
Agar
- Agar is a homopolysaccharide derived from seaweed.
- It is used as a laxative and in microbiology for culturing bacteria.
Inulin
- Composed of fructose units linked by β(2 → 1) bonds.
- Used in diagnostic tests of glomerular filtration rate (GFR).
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Description
Explore the fascinating world of carbohydrates, their chemical definitions, and essential roles in biological systems. This quiz will delve into carbohydrate function, their degradation products, and their significance in health and disease. Test your knowledge on carbohydrate classification and metabolism.