30 Questions
What is the role of non-essential amino acids in the human body?
They can be synthesized by the body to meet biological needs
How do hydrophilic amino acids interact with water?
They have partial positive and negative charges, attracting water
What is the characteristic of hydrophobic amino acids?
They are nonpolar and repel water
What happens to some amino acids after protein synthesis?
They are modified into derived amino acids
How many amino acids can the human body synthesize?
10 amino acids
What is the classification of amino acids based on their R-groups?
Hydrophobic and hydrophilic
What is the main product of the ninhydrin test, which is responsible for the blue color?
A reduced ninhydrin compound
Which of the following amino acids undergoes alpha decarboxylation to form an amine, which is a component of neurotransmitters?
Glutamic acid
What is the role of the amide group of glutamine in nucleic acid synthesis?
It serves as a source of nitrogen
Which of the following reactions is responsible for the formation of NH3 in the ninhydrin test?
Oxidative decarboxylation
What is the role of the side-chain groups in proteins?
They are free to ionize
Which of the following is NOT a component of protein structure?
Tyramine
Which of the following amino acids contains a phenyl ring?
Phenylalanine
Which category of amino acids includes Aspartic acid and Glutamic acid?
Aliphatic acidic amino acids
What is unique about Cystine among the aliphatic neutral amino acids?
It is composed of two cysteine residues linked by a disulphide bond
Which of the following amino acids is both aromatic and basic?
Histidine
What is the primary goal when comparing two sequences?
To align the two sequences to maximize the number of identical residues while minimizing the number of sequence insertions or deletions
What is the effect of a single amino acid change in the linear sequence of a protein?
It has a profound biological effect on the function
Which of the following amino acids is classified as an imino acid?
Proline
Which of the following amino acids is not an essential amino acid?
Glycine
What is unique about the primary structure of insulin?
It has two polypeptide chains held together by disulfide bonds
What is the difference between pig insulin and human insulin?
The C-terminal amino acid in the B chain
Why does de-alaninated pig insulin not produce antibodies in diabetic patients?
Because it has a similar primary structure to human insulin
What is the effect of sickle cell Hb on RBCs?
They assume a sickled form
What is the result of hydrolytic decomposition of proteins?
Proteoses
What is the effect of denaturating agents on proteins?
Irreversible denaturation
What is the consequence of breaking cross links in proteins?
Rearrangement of secondary and tertiary structures
What is the term for proteins in their natural state?
Native proteins
What is the consequence of heat treatment on albumin?
Denaturation and coagulation
What is the effect of denaturation on protein structure?
Rearrangement of secondary and tertiary structures
Learn about the classification of aliphatic amino acids into neutral, acidic, and basic categories, including examples of amino acids such as glycine, valine, and aspartic acid. This quiz covers the different subclasses of aliphatic amino acids and their characteristics. Test your knowledge of amino acid classification and structure!
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