Biology ยท 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

Amides contain more nitrogen than amino acids

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amides (like asparagine and glutamine) have a higher nitrogen to carbon ratio than amino acids, making them efficient forms for nitrogen storage and transport.

Multiple choice

Asparagine & Glutamine are formed from

  1. Aspartic acid

  2. Glutamic acid

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Asparagine is formed from aspartic acid and glutamine is formed from glutamic acid by the addition of another amino group.

Multiple choice

Fe activates catalase enzyme

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Iron (Fe) is a vital cofactor for several enzymes, including catalase and peroxidase, which are involved in the breakdown of hydrogen peroxide.

Multiple choice

Nitrogen is one of the major constituent of

  1. Proteins

  2. Nucleic acids

  3. Vitamins and Hormones

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen is a major constituent of proteins, nucleic acids, vitamins, and hormones, making it essential for plant growth and development.

Multiple choice

Mg is an activator of

  1. Rubisco

  2. PEP carboxylase

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Magnesium (Mg) acts as an activator for both Rubisco (in the Calvin cycle) and PEP carboxylase (in C4 and CAM photosynthesis).

Multiple choice

Structural elements as components are

  1. C, H, O, Mg

  2. C , H, O, Fe

  3. C, H, O, N

  4. C, H, O, S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Structural elements are those that form the backbone of organic molecules. Carbon, Hydrogen, Oxygen, and Nitrogen are the primary structural components of biological molecules like proteins and nucleic acids.

Multiple choice

Abnormally folded protein is

  1. Virion

  2. Viroid

  3. Virusoid

  4. Prion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prions are infectious agents composed entirely of protein material that can fold in multiple, structurally abstract ways, at least one of which is transmissible to other prion proteins.

Multiple choice

RQ of Protein

  1. 0.8 - 0.9

  2. 4

  3. 0.71

  4. 1.3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Respiratory Quotient (RQ) for proteins typically ranges from 0.8 to 0.9 depending on the amino acid composition.

Multiple choice

Proteins are degraded by proteases

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proteins are broken down into amino acids by enzymes known as proteases, which is the first step in protein catabolism.

Multiple choice

Which of the following statements about enzymes is NOT true?

  1. Enzymes are not re-usable

  2. Enzymes are catalyst.

  3. Enzymes are specific.

  4. Enzymes are proteins.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Enzymes are catalysts that are not consumed in reactions, so they are indeed re-usable. The statement claiming they are not re-usable is false.

Multiple choice

Name two components of chromosomes

  1. DNA and RNA

  2. DNA and Protiens

  3. DNA and lipids

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chromosomes are made of DNA coiled around histone proteins. RNA molecules are transcribed from DNA but are not structural chromosome components. Lipids are major components of cell membranes, not chromosomes.