Biochemistry in Biotechnology MCQs

Question 1

ATP biosynthesis takes place utilizing the H+ gradient in mitochondria and chloroplasts. Identify the correct sites of H+ gradient formation.

Accepted Answer

Across the inner membrane of mitochondria and across the thylakoid membrane of chloroplast

Answer

Across the outer membrane of mitochondria and across the inner membrane of chloroplast

Answer

Within the matrix of mitochondria and across the inner membrane of chloroplast

Answer

Within the matrix of mitochondria and within the stroma of chloroplast

Question 2

An enzyme catalyzes a reaction by

Accepted Answer

Decreasing the activation energy of the reaction

Answer

Decreasing the energy of the substrate

Answer

Decreasing product stability

Answer

Increasing the activation barrier of the reaction

Question 3

Match the entries in Group I with the enzymes in Group II. Group I Group II P. NAD+ 1. Glutathione peroxidase Q. Selenium 2. Nitrogenase R. Pyridoxal phosphate 3. Lactate dehydrogenase S. Molybdenum 4. Glycogen phosphorylase

Accepted Answer

P-3, Q-1, R-4, S-2

Answer

P-3, Q-2, R-4, S-1

Answer

P-4, Q-1, R-3, S-2

Answer

P-3, Q-4, R-2, S-1

Question 4

Which one of the following need NOT be conserved in a biochemical reaction?

Accepted Answer

Total moles

Answer

Total mass

Answer

Number of atoms of each element

Answer

Total energy

Question 5

In zinc finger proteins, the amino acid residues that coordinate zinc are

Accepted Answer

Cys and His

Answer

Asp and Glu

Answer

Arg and Lys

Answer

Asp and Arg