All Free Biology MCQs with Answers

• A. Golgi Apparatus
• B. Ribosome
• C. Mitochondria
• D. DNA of a gene

Explanation: The correct answer is Ribosome. Ribosomes are vital cellular organelles that facilitate the synthesis of proteins by translating the…

• A. Water has high specific heat
• B. Water has high heat of vaporization
• C. Water is not a universal solvent
• D. Water exhibits strong cohesion tension

Explanation: The correct answer is Option C: Water is not a universal solvent. While water is capable of dissolving many polar and ionic substances due…

• A. A: Condensation
• B. B: Hydrolysis
• C. C: Dehydration synthesis
• D. D: Both A and C

Explanation: The correct answer is D: Both A and C. Dehydration synthesis and condensation are two terms for the process of forming a large molecule…

• A. Globular proteins
• B. Intermediate proteins
• C. Fibrous Proteins
• D. Integral proteins

Explanation: Actin and myosin are classified as fibrous proteins because of their elongated filamentous structure, which is crucial for their role in…

• A. I. Phosphate; II. Ribose; III. Nitrogenous base
• B. I. Phosphate; II. Nitrogen base; III. Ribose
• C. I. Nitrogenous base; II. Phosphate; III. Ribose
• D. I. Ribose; II. Nitrogen base; III. Phosphate

Explanation: The correct answer is Option A: I. Phosphate; II. Ribose; III. Nitrogenous base.

• A. Water
• B. Carbohydrates
• C. Lipids
• D. Proteins

Explanation: Water is essential for life and participates in numerous biological processes, including digestion, circulation, and chemical reactions.

• A. Drug carriers
• B. Water in middle
• C. Sac of phospholipids
• D. ALL A, B, C

Explanation: Liposomes are spherical vesicles that act as drug carriers, containing water in their central core surrounded by a lipid bilayer.

• A. Hydrogen bonding
• B. Peptide bond
• C. Disulfide bond
• D. Both A and B

Explanation: Proteins with a secondary structure have both hydrogen bonding and peptide bonds as essential elements of their stability and…

• A. High proprortion of oxygen
• B. Low proportion of carbon
• C. Lower proportion of C-H bond
• D. High proportion of C-H

Explanation: Option D is correct. Yes, that is correct. Lipids contain more energy than carbohydrates because they have a higher proportion of…

• A. Three groups
• B. Seven groups
• C. Three to seven groups
• D. More than seven groups

Explanation: Monosaccharides, Oligosaccharides and polysaccharides as per text book.

• A. (CH2O)n
• B. Cn(H2O)y
• C. Cn(H2O)n
• D. Cy(H2O)n

Explanation: These are hydrated carbons i.e. having a water molecule against each carbon.

• A. Saccharolipids or sphingolipids
• B. Glycerolipids or polyketides
• C. Triglycerides or neutral lipids
• D. Isoprene or neutral lipids

Explanation: Correct option: C) Triacylglycerols are also called triglycerides or neutral lipids.

• A. No double bond
• B. One the six double bonds
• C. Low melting point
• D. Part of plant fats

Explanation: Correct option: A) No double bond does not belong to unsaturated fatty acids.

• A. 61.3oC
• B. 63.1oC
• C. 80oC
• D. -8oC

Explanation: Correct option: B) The melting point of palmitic acid is approximately 63.1°C.

• A. Animal
• B. Plant
• C. All
• D. None

Explanation: Animal fatty acids are saturated fatty acids and have higher melting points. Hence they are solid at room temperature.

• A. Triacylglycerol
• B. Diacylglycerol
• C. Monoacyl glycerol
• D. Monoglyceride

Explanation: The most widely spread glycerol is triacylglycerol also called triglycerides.

• A. Glycerol
• B. Alcohol
• C. Phosphoric acid
• D. Fatty acids

Explanation: The hydrophobic tails of phospholipids are indeed fatty acids that are non-polar.

• A. Remain stable
• B. Lie flat
• C. Acquire coiling
• D. Acquire folding

Explanation: Most of the primary proteins are folded, refolded and aggregated to acquire secondary, tertiary and quaternary structural levels…

• A. Primary protein
• B. Secondary protein
• C. Tertiary protein
• D. Quaternary protein

Explanation: It involves primary ,secondary and tertiary levels as well.The quaternary structure of a protein is the most complex level of protein…

• A. A French chemist
• B. A German chemist
• C. ASwiss chemist
• D. A Spanish chemist

Explanation: The molecule now known as DNA was first identified in the 1860s by a Swiss chemist called Johann Friedrich Miescher.