Biology · Chemistry

Biomolecules and Enzymes

1,501 Questions

This topic focuses on biomolecules, specifically proteins, enzymes, and amino acids. It includes questions on enzyme structures, protein folding, and catalysis. These concepts are crucial for medical and biology competitive exams.

Enzyme catalysisProtein structuresAmino acid synthesisPolypeptide chainsBiomolecule properties

Biomolecules and Enzymes Questions

Multiple choice

In human body carbohydrates are stored in

  1. kidneys

  2. only liver

  3. liver and muscles

  4. only muscles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbohydrates in the human body are stored as glycogen, primarily in the liver and muscles. Liver glycogen maintains blood sugar levels, while muscle glycogen provides energy for muscle contraction. Carbohydrates are not stored in kidneys, and storing them in only one location (either liver or muscles alone) would not meet the body's energy needs.

Multiple choice

Match the entries in Column I (coenzyme) and Column II (its dietary precursor in mammals).

 
Column I Column II
P. Coenzyme A 1. Vitamin B1
Q. Flavinadinine dinucleotide 2. Vitamin B6
R. Thiamine pyrophosphate 3. Vitamin B12
S. Pyridoxal phosphate 4. Vitamin B5

  1. P - 1; Q - 3; R - 2; S - 4

  2. P - 2; Q - 4; R - 1; S - 3

  3. P - 3; Q - 4; R - 1; S - 2

  4. P - 4; Q - 3; R - 1; S - 2

  5. P - 4; Q - 3; R - 2; S - 1
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dietary precursor of coenzyme A is vitamin B5. Dietary precursor of flavinadinine dinucleotide is vitamin B12. Dietary precursor of thiamine pyrophosphate is vitamin B1. Dietary precursor of pyridoxal phosphate is vitamin B6.

Multiple choice

Which of the following is a selenium containing enzyme?

  1. Glutathione peroxidase

  2. Carbonic anhydrase

  3. Urease

  4. Dopamine beta-hydroxylase

  5. Tyrosinase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Selenium is an important constituent of the enzyme glutathione peroxidase, which is responsible for destroying lipid-damaging peroxides.