Home
General Knowledge (GK)
General Science and Nature
- Biology MCQs

Home

General Science and Nature

Biology MCQs

Cell Biology

All MCQs

Cell Biology

Sign in

Hay, Enter your details to get sign in to your account

Forgot Password?

Don't have an account Sign up

Sign up

Hay, Enter your details to get sign up to your account

Have an account already Sign in

101.

Which molecule forms the backbone of the DNA double helix?

Glucose

Amino acids

Nucleotides

Fatty acids

Explanation Comments

Answer: Nucleotides

Explanation:

DNA is composed of nucleotides, each consisting of a phosphate group, a sugar molecule (deoxyribose), and a nitrogenous base, forming the backbone of the double helix.

Hide Explanation

102.

Which organelle is primarily involved in the synthesis of ATP in plant cells?

Ribosome

Chloroplast

Mitochondrion

Lysosome

Explanation Comments

Answer: Chloroplast

Explanation:

Chloroplasts in plant cells capture light energy and convert it into chemical energy in the form of ATP and glucose through the process of photosynthesis.

Hide Explanation

103.

What is the role of lysosomes in the cell?

Digestion and waste removal

Protein synthesis

Cell division

Energy production

Explanation Comments

Answer: Digestion and waste removal

Explanation:

Lysosomes contain hydrolytic enzymes that break down waste materials and cellular debris, aiding in digestion and waste removal.

Hide Explanation

104.

What is the main purpose of the sodium-potassium pump in cellular membranes?

To maintain cell membrane potential

To synthesize proteins

To facilitate diffusion of sodium and potassium

To generate ATP

Explanation Comments

Answer: To maintain cell membrane potential

Explanation:

The sodium-potassium pump actively transports sodium ions out of the cell and potassium ions into the cell, maintaining the electrochemical gradient and membrane potential.

Hide Explanation

105.

Which phase of the cell cycle is characterized by the cell growing and carrying out normal functions?

S phase

G2 phase

M phase

G1 phase

Explanation Comments

Answer: G1 phase

Explanation:

The G1 phase is the first stage of interphase, during which the cell grows and performs its normal metabolic functions.

Hide Explanation

106.

What type of bond holds the two strands of DNA together?

Covalent bonds

Peptide bonds

Hydrogen bonds

Ionic bonds

Explanation Comments

Answer: Hydrogen bonds

Explanation:

Hydrogen bonds between complementary nitrogenous bases (adenine-thymine and cytosine-guanine) hold the two strands of the DNA double helix together.

Hide Explanation

107.

Which organelle is responsible for photosynthesis in plant cells?

Chloroplast

Ribosome

Mitochondrion

Endoplasmic reticulum

Explanation Comments

Answer: Chloroplast

Explanation:

Chloroplasts contain chlorophyll and are the sites of photosynthesis, where light energy is converted into chemical energy in the form of glucose.

Hide Explanation

108.

Which molecule is primarily involved in transporting oxygen in the blood of vertebrates?

Collagen

Albumin

Hemoglobin

Myoglobin

Explanation Comments

Answer: Hemoglobin

Explanation:

Hemoglobin is a protein in red blood cells that binds to oxygen and transports it from the lungs to the tissues and cells throughout the body.

Hide Explanation

Quick Links

Cell Biology

Genetics and Molecular Biology

Evolutionary Biology

Physiology and Anatomy

Home
About
Blog
Contact