amino acid and protein

Question 1

What are the building blocks of proteins?

Answer 1

Amino Acids

Question 2

Which amino acids are essential (must be obtained from diet)?

Answer 2

Methionine, Threonine, Tryptophan, Valine, Isoleucine, Leucine, Lysine, Phenylalanine, Histidine

Question 3

What type of bond connects amino acids in proteins?

Answer 3

Peptide Bond

Question 4

Name an amino acid that is both glucogenic and ketogenic.

Answer 4

Isoleucine, Phenylalanine, Tyrosine, Tryptophan

Question 5

Which protein structure level determines the sequence of amino acids?

Answer 5

Primary Structure

Question 6

What protein is defective in sickle cell anemia?

Answer 6

Hemoglobin (mutation: Glutamate → Valine in β-globin)

Question 7

What disease is caused by misfolded prion proteins (PrP)?

Answer 7

Prion Diseases (e.g., Creutzfeldt-Jakob Disease, Mad Cow Disease)

Question 8

Which of the following amino acids is acidic?
A) Histidine
B) Aspartic Acid
C) Valine
D) Tryptophan

Answer 8

B) Aspartic Acid

Question 9

What type of bond stabilizes α-helices and β-sheets?
A) Ionic Bonds
B) Hydrogen Bonds
C) Disulfide Bonds
D) Peptide Bonds

Answer 9

B) Hydrogen Bonds

Question 10

Which protein transports oxygen in the blood?
A) Albumin
B) Hemoglobin
C) Collagen
D) Keratin

Answer 10

B) Hemoglobin

Question 11

What amino acid is a precursor for serotonin?
A) Tryptophan
B) Tyrosine
C) Histidine
D) Glutamate

Answer 11

A) Tryptophan

Question 12

Which level of protein structure involves multiple polypeptide chains?
A) Primary
B) Secondary
C) Tertiary
D) Quaternary

Answer 12

D) Quaternary