11th class (FSc) Biology Unit 2 MCQs
Chapter 2 MCQs 11th Class Biology
Biological Molecules:
1. Animals obtain carbohydrates main from:
a. Sucrose
b. Glucose
c. Glycogen
d. Starch
2. Peptide bond is a:
a. N – H link
b. C – N link
c. C – H link
d. C – O link
3. Globular proteins differ from fibrous proteins in:
a. Being soluble in aqueous medium
b. Having amino acids
c. Being non-crystalline
d. Their repeating units joined by peptide bond
4. Which of the following kinds of atom do not occur in carbohydrates?
a. Nitrogen
b. Carbon
c. Oxygen
d. Hydrogen
5. Amino acids are arranged in proper sequence during protein synthesis according to the instruction transcribed on:
a. Messenger RNA
b. Transfer RNA
c. DNA
d. Ribosomal RNA
6. The percentage of water in bacterial cell is about?
a. 50%
b. 15%
c. 70%
d. 18%
7. The most abundant organic compound in mammalian cell:
a. carbohydrates
b. Water
c. Lipids
d. Proteins
8. Monosacchrides, which are rare in nature and occur in some bacteria is:
a. Pentoses
b. Trioses
c. Hexoses
d. Tetroses
9. All the chemical reactions taking place within a cell are collectively called:
a. Metabolism
b. Anabolism
c. Chemibolism
d. Catabolism
10. The first microbe to have the genome completely sequenced is:
a. Salmonella typhi
b. Haemophillus infuenzae
c. E. coli
d. Pneumococcus
11. The branch of Biology, which deals with the study of chemical components and the chemical processes in living organisms is:
a. Biometry
b. Biochemistry
c. Bioprocessing
d. Biotechnology
12. In living organisms carbohydrates, proteins, lipids and nucleic acids are most important:
a. Organic compounds
b. Inorganic compounds
c. Both a & b
d. None
13. Those reactions in which simpler substances are combined to form complex substances are called:
a. Anabolic reactions
b. Catabolic reactions
c. Endothermic reactions
d. Exothermic reactions
14. Anabolic reactions:
a. Release energy
b. Need energy
c. Both a & b
d. None
15. Energy is released by the breakdown of complex molecules into simpler ones, such reactions are called:
a. Anabolic reactions
b. Catabolic reactions
c. Endothermic reactions
d. Metabolic reactions
16. When two or more atoms complete their election shells by sharing electrons, the bond is called:
a. Bivalent
b. Ionic
c. Tetravalent
d. Covalent
17. The potential source of chemical energy for cellular activities:
a. C –O bond
b. C – H bond
c. C – C bond
d. C – N bond
18. The basic element of organic compound is:
a. Nitrogen
b. Hydrogen
c. Oxygen
d. Carbon
19. The basic elements of organic compounds is:
a. Oxygen
b. Hydrogen
c. carbon
d. Nitrogen
20. Due to its unique properties; the central position in the skeleton of life is occupies:
a. Oxygen
b. Hydrogen
c. Carbon
d. Nitrogen
21. When a carbon atom combines with four atoms or redcals, the four bonds are arranged symmetrically in a:
a. Pentahedrop
b. Triangular
c. Octahedron
d. Tetrahedron
22. Carbon and hydrogen bond (C-H) is the potential source of ……… for cellular activities.
a. Solar energy
b. Kinetic energy
c. Chemical energy
d. Heat energy
23. Some small molecules are so unstable they are immediately broken down to release energy e.g.
a. NAD
b. ATP
c. FAD
d. AIDS
24. The percentage of water in human bone cell is:
a. 20%
b. 18%
c. 25%
d. 19%
25. The amount of heat absorbed when liquid changes into gas, is expressed as calories per gram vaporized is called:
a. Heat of Vaporization
b. Heat Capacity
c. Latent
d. Specific Heat