Questions- Zoology

1. Hemolin is

(a) An antibody produced by sponges

(b) An antibody produced by Annelids

(c) A member of the immunoglobulin superfamily

(d) A cytotoxic molecule produced by nematodes

Ans: Hemolin is a bacteria-inducible hemolymph protein of the giant silk moth Hyalophora cecropia. Hemolin belongs to the immunoglobulin superfamily

2. Most modern taxonomists group living organisms into how many kingdoms?

(a) 2

(b) 4

(c) 3

(d) 5

Ans:  5

• complexity of cell structure
• complexity of organism body
• mode of obtaining nutrition

3. Acrosome present on the sperm head is derived from

(a) Golgi apparatus

(b) Nucleus

(c) Centrosome

(d) Endoplasmic reticulum

Ans: Golgi apparatus

• The golgi body is modified to form a sheath called acrosome on the first part of the head

4. Which of the following non-covalent interactions is considered as strongest?

(a) Hydrophobic interactions

(b) Ionic bonds

(c) Hydrogen bonds

(d) Vander waals forces

Ans: Hydrogen bonds

5. Sickle-cell anemia is caused by mutation in

(a) Haemoglobin A

(b) Haemoglobin B

(c) Haemoglobin S

(d) Haemoglobin F

Ans: Haemoglobin A

• Molecular basis for this disease: change of glutamic acid residue for a valine (non conservative substitution reaction).
• Normal Hb: Hb A (adult)
• Sickle cell Hb: Hb S

6. Life appeared on earth

a) 5000 million years ago

b) 3500 million years ago

c) 1000 million years ago

d) 500 million years ago

Ans: b) 3500 million years ago

7. The sub cellular organelle not bound by a single membrane is

a) Golgi apparatus

b) Endoplasmic Reticulam (ER)

c) Mitochondria

d) Lysosomes

Ans: Mitochondria

• Double membrane organelle (Nucleus, Chloroplast, Mitochondria)

8. The storage carbohydrate in animal is

a) Starch

b) Cellulose

c) Glycogen

d) Glucose

Ans: Glycogen

• Starch: storage carbohydrate in plants
• Cellulose: structural polysaccharide in the plant cell wall
• Glucose: primary energy source

9. The hormone testosterone is produced by

a) Leydig cells

b) Spermatocyte

c) Melanocytes

d) β cells of Pancreas

Ans: a) Leydig cells

10. The predominant antibody in saliva is

a) IgG

b) IgM

c) IgA

d) IgD

Ans: c) IgA

• IgG: Most abundant immunoglobulin, produce in the late primary response after IgM production, predominant in secondary immune response, the one and only Ig that cross placenta.
• IgA: Secretory antibody, Heaviest antibody and second most abundant
• IgM: Macroimmunoglobulin, pentamer, does not cross placenta, also known as natural antibody, first produced antibody upon infection.
• IgD: Present on surface of B-cells and in serum.
• IgE: which is responsible for allergic reactions, mediate hyper sensitivity. These are concentrated in mucous membrane, skin and lungs.