All Free Biology MCQs with Answers

• A. Phospholipid
• B. Polysaccharides
• C. Carbohydrates
• D. Both B and C

Explanation: Glycogen is a complex carbohydrate that serves as a form of energy storage in animals and is classified as a polysaccharide because it…

• A. Fatty acids and Water
• B. Fatty acids and Alcohols
• C. Fatty acids and Glucose
• D. Fatty acids and Phosphates

Explanation: Acylglycerols like fats and oils are esters formed by condensation reaction between fatty acids and alcohols.

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

Explanation: The regular coiling or zigzagging of a polypeptide chain through hydrogen bonding between the amino acid residues forms its secondary…

• A. Carboxyl acid
• B. Phenol
• C. Water
• D. Alcohol

Explanation: The explanation for this question will be added soon!

• A. Simple proteins
• B. Conjugated proteins
• C. Derived proteins
• D. None

Explanation: The most abundant protein in animals, forming 25%-35% of body protein, is a type of conjugated protein known as hemoglobin.

• A. Amylase
• B. Lipase
• C. Maltase
• D. Protease

Explanation: Lipase breaks down fats( triglycerides) into their constituent fatty acids and glycerol

• A. Acid halides
• B. Binary compounds
• C. Ester
• D. Alkanes

Explanation: Explanation for this question will be added soon!

• A. Animals
• B. Plants
• C. Human being
• D. None

Explanation: Explanation for this question will be added soon!

• A. A chromosome
• B. Circular extrachromosomal DNA
• C. A protein
• D. A virus

Explanation: Plasmids are small, circular, extrachromosomal DNA molecules in bacteria used as vectors in genetic engineering.

• A. Natural breeding
• B. In vitro fertilization
• C. Somatic cell nuclear transfer
• D. Gene therapy

Explanation: Dolly was the first mammal cloned from an adult somatic cell using nuclear transfer (SCNT).

• A. Mutation ⎯→ Deficient ADA ⎯→ Immature T and B cells ⎯→ SCIDS
• B. SCIDS ⎯→ Deficient ADA ⎯→ Immature T and B cells ⎯→ Mutation
• C. Mutation ⎯→ Deficient ADA ⎯→ SCIDS ⎯→ Immature T and B cells
• D. Mutation ⎯→ Immature B and T cells ⎯→ Deficient ADA ⎯→ SCIDS

Explanation: When that gene which is responsible for the formation of ADA mutates. ADA will be formed and as a result Tand B cells will remain unable…

• A. Parthenogenesis
• B. Parthenocarpy
• C. Cutting
• D. Grafting

Explanation: Parthenogenesis is a form of reproduction in which an egg develops into an embryo without fertilization.

• A. Cl- ions
• B. Na+ ions
• C. K+ ions
• D. Ca2+ ions

Explanation: This is the correct answer. Cystic fibrosis (CF) is a genetic disorder caused by mutations in the gene that codes for the cystic fibrosis…

• A. Restriction enzyme
• B. DNA Ligase
• C. Macrosatellites
• D. Probes for genetic markers

Explanation: In DNA fingerprinting, probes for genetic markers are used to identify markers such as microsatellites and thus produce distinctive…

• A. Techniques used to identify physical fingerprints of individuals
• B. Molecular analysis of DNA profiles to identify individuals
• C. Use of imprinting devices to analyze DNA samples
• D. Combination of physical fingerprint identification and DNA analysis using imprinting devices

Explanation: DNA fingerprinting, also known as DNA profiling, is a molecular technique used to identify individuals based on unique patterns within…

• A. Transgenic mice for testing the safety of polio vaccine before use in humans
• B. Transgenic models for studying new treatments for certain cardiac diseases
• C. Transgenic cow­-Rosie which produces high fat milk for making ghee
• D. Animals like bulls for farm work as they have extra power

Explanation: Many transgenic animals are designed to increase our understanding of how genes contribute to the development of diseases.

• A. Addition of preservatives to the product.
• B. Purification of the product.
• C. Ensuring anaerobic conditions in the culture vessel.
• D. Availability of oxygen throughout the process.

Explanation: A stirred-­tank bioreactor is usually cylindrical or with a curved base to facilitate the mixing of the reaction contents.

• A. Pollen grain
• B. Root tips
• C. Young leave
• D. Endosperm.

Explanation: Haploid plants are those plants that have a single set of chromosomes. Pollen grains are haploid as they are produced after meiosis so…

• A. DNA polymerases
• B. DNA ligases
• C. Restricted endonucleases
• D. Reverse transcriptases

Explanation: Reverse transcriptases are used to synthesize cDNA from RNA (e.g. mRNA) template.

• A. DNA of bacteria
• B. DNA of plant viruses
• C. DNA of bacterial viruses
• D. DNA of animal viruses

Explanation: DNA of bacteriophage or phage virus or bacterial virus is also used as vector.