MCQs BIOCHEMISTRY: Protein Structure

1.
Beta pleated sheets are examples of protein's

A. primary structure
B. secondary structure
C. tertiary structure
D. quaternary structure
Answer & Explanation
Answer: Option B

1.
Beta pleated sheets are examples of protein's

A. primary structure
B. secondary structure
C. tertiary structure
D. quaternary structure
Answer & Explanation
Answer: Option B

3.
Metastasis involves

A. ability of cells to dissolve cellular matrix
B. metalloprotein levels
C. decreased levels of proteins that regulate metalloproteins
D. all of the above
Answer & Explanation
Answer: Option D

4.
Signal sequences are part of a protein that

A. signal folding of the protein
B. signal the protein synthesis on the ribosomes is ended
C. transport proteins to other sites within the cell
D. refold proteins in prion-associated diseases
Answer & Explanation
Answer: Option C
5.
Individuals with PKU disease are mentally retarded unless

A. phenylalanine in the diet is restricted
B. tyrosine in the diet is restricted
C. homogentisic acid in the diet is restricted
D. none of the above
Answer & Explanation
Answer: Option A

6.
Marfan's syndrome is thought to be a mutation affecting

A. hemoglobin synthesis
B. collagen synthesis
C. metabolism of homogentisic acid
D. insufficient thyroid production
Answer & Explanation
Answer: Option B

7.
Cyclins are proteins that

A. regulate ability of cells to invade tissue
B. regulate passage from one stage of cell division to another
C. regulate apoptosis of damaged cells
D. none of the above
Answer & Explanation
Answer: Option B

8.
Over 50% of common cancers are associated with damage to a protein, p53. This protein

A. is a cyclin
B. is a tumor supressor
C. is an oncogene
D. regulates apoptosis
Answer & Explanation
Answer: Option B

9.
Protein folding is

A. automatic, mediated by the protein itself
B. mediated by other proteins called chaperones
C. mediated by the ribosomes
D. none of the above
Answer & Explanation
Answer: Option B

10.
Sickle cell disease is due to

A. a mutation in the beta chain of Hb
B. a mutation in the alpha chain of Hb
C. infection with a parasite
D. none of the above
Answer & Explanation
Answer: Option A

11.
The four subunits of the hemoglobin (Hb) gene represent protein's

A. primary structure
B. secondary structure
C. tertiary structure
D. quaternary structure
Answer & Explanation
Answer: Option D