Biology Chapter 3 Entry test MCQs
Topic 3:
Introduction to Biological Molecules
1. The sum of all chemical reactions taking place within a cell is called:
a. Metabolism
b. Thermoregulation
c. Isomerism
d. Osmoregulation
2. Which one of the following is an example of anabolic process?
a. Respiration
b. Digestion
c. Photosynthesis
d. Both A and B
3. A mammalian cell contains 1.1 percentage:
a. DNA
b. Protein
c. RNA
d. Water
4. Most abundant organic compounds of a cell are:
a. Carbohydrates
b. Water
c. Lipids
d. Proteins
5. Water is a very good solvent for substance due to its to its higher heat capacity. nature and act as due
a. Organic, inorganic
b. Dipole nature, thermo-stabilizer
c. Ionic, covalent
d. Polar, bipolar
Importance of Water
6. Due to higher heat capacity and H-bonds, water acts as:
a. Inert medium
b. Thermo-stabilizer
c. Reactive medium
d. Solvent
7. The water molecules remain attached together and do not separate because of this bonding:
a. Hydrogen
b. Non-covalent
c. Hydrophobic
d. Ionic
8. Which property of water plays an important role in regulation of heat produced by oxidation?
a. Dipole nature
b. Heat capacity
c. Ionization of water
d. Heat of vaporization
9. If water has high latent heat of vaporization, how this property of water could be helpful to plants and animals?
a. It will keep their temperature very high
b. With the release of large amount of water vapors, a small amount of heat loss can take place
c. With the release of small amount of water vapors, a great amount of heat loss can take place
d. No cooling effect with the release of even large amount of water vapors
10. Which property of water helps to maintain the integrity of lipid membranes?
a. Hydrogen bonding
b. Specific heat capacity
c. Hydrophobic exclusion
d. Cohesion and adhesion
11. Water acts as universal solvent because of:
a. Hydrogen bonding
b. Heat of vaporization
c. Cohesion and adhesion
d. High polarity
12. Water acts as a temperature stabilizer for many organisms in the environment because of its:
a. High specific heat capacity
b. High Surface tension
c. Density
d. Latent heat of vaporization
13. Ice floats on water due to which property of water:
a. Ionization
b. Low density
c. Hydrophobic exclusion
d. Heat of vaporization
Carbohydrates
14. Most abundant carbohydrate in nature is:
a. Starch
b. Cellulose
c. Glycogen
d. Polysaccharides
15. All of the following yield glucose on complete hydrolysis except:
a. Glycogen
b. Starch
c. Chitin
d. Cellulose
16. Glucose combines with……………to form milk sugar.
a. Fructose
b. Glucose
c. Mannose
d. Galactose
17. Formation of a tri-saccharide involves release of …………water molecule.
a. 2
b. 1
c. 4
d. 3
18. How many carbon atoms are present inside the ring of fructose?
a. 4
b. 6
c. 3
d. 5
19. Which of the following polysaccharide is present in human muscles abundantly?
a. Collagen
b. Myoglobin
c. Glycogen
d. Actin and myosin
20. Pick out the odd one:
a. Galactose
b. Cellulose
c. Pectin
d. Agar
21. Which of the following carbons are present outside the ring of fructose?
a. 1st carbon and 5th carbon
b. 1st carbon & 2nd carbon
c. 1st carbon and 6th carbon
d. Only 1st carbon
22. Which of the following sugars is the sweetest?
a. Sucrose
b. Glucose
c. Maltose
d. Fructose
23. In a disaccharide, if carbon atoms are 12 then how many OH groups will be present?
a. 8
b. 11
c. 12
d. 10
24. Which of the following is non-reducing disaccharide sugar?
a. Maltose
b. Mannose
c. Lactose
d. Sucrose
25. Which of the following sugar is mainly present in human blood?
a. Fructose
b. Glucose
c. Mannose
d. Sucrose