All Free Biology MCQs with Answers

• A. Esterified cholesterol
• B. Glycerophospholipids
• C. Triglycerides
• D. Sphingolipids

Explanation: Correct option is C. Lipids are stored in the body in different forms such as, triglycerides, fat cells, cell membranes and lipoproteins.

• A. Increase in saturated fatty acids in the membrane
• B. Increase in glycolipid content in the membrane
• C. Increase in phospholipid content in the membrane
• D. Increase in unsaturated fatty acids in the membrane

Explanation: The absence or decrease of double bonds, decreases the fluidity, making the membrane strong and rigid.

• A. Palmitic acid
• B. Stearic acid
• C. Acetic acid
• D. Linolenic acid

Explanation: Here the most suitable answer will be acetic acid. Other molecules shown resemble fatty acids; they all have long hydrocarbon chains with…

• A. Lymphoid masses
• B. Lymph vessels
• C. Spleen
• D. Lungs

Explanation: The four organs of the lymphatic system are bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels.

• A. A.V. Leeuwenhoek
• B. Pasteur
• C. Hans
• D. Janssen

Explanation: The first compound microscopes date to 1590, but it was the Dutch Antony Van Leeuwenhoek in the mid-seventeenth century who first used…

• A. Homozygous dominant
• B. Heterozygous
• C. Homozygous recessive
• D. None of these

Explanation: Pattern baldness is a sex influenced trait. It is inherited as an autosomal dominant trait in males but as an autosomal recessive trait in…

• A. A and AB
• B. A and B
• C. A and O
• D. None of these

Explanation: a) A and AB:If one parent has blood type A and the other parent has blood type AB, it is possible for their children to have different…

• A. Incomplete dominance
• B. Codominance
• C. Epistasis
• D. Crossing over
• E. Linkage

Explanation: Explanation for this question will be added soon.

• A. 3 : 1
• B. 9 : 3 :3 : 1
• C. 12 : 3 : 1
• D. 9 : 3 : 4
• E. 12 : 9 : 3 : 1

Explanation: Explanation for this question will be added soon.

• A. 3:1
• B. 1:3
• C. 1:1
• D. All short
• E. All tall

Explanation: Explanation for this question will be added soon.

• A. Complete dominance
• B. Codominance
• C. Partial dominance
• D. All of these

Explanation: Complete dominance is a form of dominance wherein the dominant allele completely masks the effect of the recessive allele in heterozygous…

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: The trait of kernel colour in corn is controlled by three pairs of genes.

• A. 10
• B. 17
• C. 6
• D. 14
• E. 11

Explanation: Explanation for this question will be added soon.

• A. Corpus Luteum
• B. Uterus
• C. Pituitary gland
• D. Ovary
• E. Both c and b

Explanation: Explanation for this question will be added soon.

• A. Ovulation
• B. Decrease in FSH production
• C. Increase in estrogen level
• D. Both B and C

Explanation: Option A: Ovulation is the process of releasing a mature egg from the ovary.

• A. Progesterone
• B. FSH
• C. LH
• D. Testosterone

Explanation: As the egg migrates down the fallopian tube, progesterone is released. It is secreted by a temporary gland formed within the ovary after…

• A. Luteinizing Hormone
• B. Inhibin
• C. Follicle-Stimulating Hormone
• D. Testosterone

Explanation: FSH is responsible for stimulating the growth and development of ovarian follicles in the ovaries.

• A. FSH and estrogen
• B. LH and estrogen
• C. FSH and LH
• D. Estrogen and progesterone

Explanation: FSH and LH, both produced by the anterior pituitary gland, regulate the menstrual cycle.

• A. Ovulation
• B. Menstruation
• C. Oestrous
• D. All of these

Explanation: Ovulation is the release of a mature egg (ovum) from the ovary, and it typically occurs once during each menstrual cycle in humans.

• A. Endometrium
• B. Perimetrium
• C. Corpus luteum
• D. None of these

Explanation: After ovulation has occurred, the remains of the follicle forms the corpus luteum which is a structure involved in the secretion important…