Biology Exam Notes

Objective Questions

1. DNA Polymerase Enzyme

• The DNA polymerase enzyme that plays a supporting role in DNA replication is:
  • Polymerase I

2. S-Phase of Cell Cycle

• The S-phase of the cell cycle takes approximately:
  • 9 hours

3. Synapsis During Meiosis

• Pairing of homologous chromosomes (synapsis) starts during:
  • Leptotene

4. Blood Groups

• A person having neither antigen A nor B would have blood group:
  • O

5. Genetically Modified Organisms

• Organisms that have a foreign gene inserted into them are called:
  • Transgenic organism

6. Archaebacteria Tolerance

• Archaebacteria can tolerate temperatures up to:
  • 120°C

7. Lithosphere Composition

• Lithosphere includes:
  • Earth, soil

8. Grassland Ecosystems - Tropical Climates

• In grassland ecosystems, tropical climates have woody trees called:
  • Savanna

9. Cause of Acid Rain

• The cause of acid rain is:
  • **Oxides of $NO<em>2$ and $SO</em>2$

10. Function of Sweat Glands

• Removal of salts with water from sweat glands and of sebum seems to be:
  • Both Protective & Thermo-regulation

11. Blood Supply to Kidneys

• Kidneys receive what amount of blood supplied with each cardiac beat:
  • 25%

12. Xylem Structures

• Long tubular structures join end to end to form long water-conducting pipes in xylem are known as:
  • Vessels

13. Tropomyosin Polypeptide Chains

• Tropomyosin is a complex of how many polypeptide chains?
  • Triple

14. Pain Receptors

• The receptors which have undifferentiated endings and produce sensation of pain are called:
  • Nociceptors

15. Haploid Cell

• Which is a haploid cell?
  • Secondary spermatocyte

16. Cell Size Attainment

• The final size of a given type of cell is attained during:
  • Growth

17. Blastoderm Peripheral Part

• The peripheral part of the blastoderm where the cells lie unseparated from the yolk is called:
  • Area opaca