All Free Biology MCQs with Answers

• A. 6
• B. 2
• C. 4
• D. 8

Explanation: Fatty acids are organic molecules consisting of a hydrocarbon chain with a carboxylic acid group (-COOH) at one end.

• A. Ester bond
• B. Ether linkage
• C. Hydrogen bond
• D. Ionic bond

Explanation: When glycerol (a type of alcohol) reacts with fatty acids (which contain carboxyl groups), an ester bond is formed through a dehydration…

• A. Glycerol
• B. Amine group
• C. Fatty Acid
• D. Phosphate group

Explanation: The phosphate group (-PO₄³⁻) in phospholipids is part of the molecule's hydrophilic head.

• A. Heart, activity of smooth muscles and valves
• B. Activity of skeletal muscles, heart and breathing movements
• C. Breathing movements, activity of skeletal muscles and valves
• D. Exercise, breathing movements and heart

Explanation: Option[a] heart has no role in lymph flowOption[b] Heart has no role in lymphOption [c] All mentioned factors affect the flow of lymph in…

• A. Subclavian Vein
• B. Renal Vein
• C. Pulmonary Vein
• D. Hepatic Portal Vein

Explanation: a) Subclavian VeinThe subclavian veins are major veins located in the upper chest region, near the collarbone.

• A. Superior vena cava
• B. Subclavian Vein
• C. Inferior vena cava
• D. Renal vein

Explanation: Lymph capillaries join to form larger and larger lymph vessels; and ultimately form the thoracic lymph duct, which opens into the…

• A. Lymph Nodes
• B. Lymphoid organs
• C. Lymph capillaries
• D. Subclavian vein

Explanation: Lymph eventually returns to the bloodstream by entering the subclavian vein, where it mixes with the blood and is recirculated through the…

• A. Evolution
• B. Paleontology
• C. Zoogeography
• D. Biodiversity

Explanation: Palaeontology is the study of prehistoric life on Earth using geological methods such as studying preserved remains of an organism in a…

• A. Phenotype.
• B. Junction.
• C. Locus.
• D. Genotype.

Explanation: A locus is the specific physical location of a gene or other DNA sequence on a chromosome, like a genetic street address.

• A. Six
• B. Four
• C. Five
• D. Five or three

Explanation: Three different gene pairs at three different loci contribute to the wheat grain color.

• A. It is autosomal recessive disease in males
• B. It is X-linked disease
• C. It is autosomal dominant disease in males
• D. It is Y-linked disease

Explanation: Explanation:It is a autosomal dominant disease in males, but it is sex influenced character as a result a female heterozygous for this…

• A. Alleles of a gene
• B. Two different genes at the same locus
• C. Two contrasting traits
• D. Two different genes at different loci

Explanation: [A] Epistasis not linked to alleles of genes[B] Two different genes are at the different loci[C] Two contrasting traits are two different…

• A. Pleiotropic
• B. Epistatic
• C. Dominant
• D. Mutant

Explanation: Pleiotropy is defined as the expression of multiple traits by a single gene.

• A. Locus
• B. Origin
• C. Amplicon
• D. Filial

Explanation: The position of genes on a chromosome is known as locus.

• A. Codominance
• B. Dominance-recessive relationship
• C. Incomplete dominance
• D. Over dominance relationship

Explanation: The round phenotype is due to the presence of the dominant allele which expresses itself regardless of the presence of the recessive…

• A. Chromosomal aberration
• B. Aneuploidy
• C. Point mutation
• D. Euploidy

Explanation: All these mutations revolve around a single nucleotide being replaced, inserted or deleted hence the term 'point'.

• A. Dominance
• B. Incomplete dominance
• C. Codominance
• D. Over-dominance

Explanation: Incomplete dominance is when a dominant allele, or form of a gene, does not completely mask the effects of a recessive allele, and the…

• A. Dominance
• B. Codominance
• C. Pleiotropy
• D. Epistasis

Explanation: Epistasis is an example of nonallelic interactions. It is defined as the phenomenon in which the effect caused by genes on one locus…

• A. 3/16 Tall-round ; 3/16 dwarf-wrinkled
• B. 9/16 Tall-wrinkled ; 3/16 dwarf-round
• C. 9/16 Tall-round ; 3/17 Dwarf-round
• D. 3/16 Tall-wrinkled ; 3/16 Dwarf-round

Explanation: As we talk about the F1 generation, we can assume them to be heterozygous for both characteristics.

• A. ¼ purple ; ¾ white
• B. ¼ white ; ¾ purple
• C. All white
• D. All purple

Explanation: As it is mentioned in the question that it is pure breeding, we can assume the pea plants involved in the breeding to be homozygous…