Biology Past Questions And Answers
The eyes can properly focus images of objects of various distances on the retina by a process called
- A. refraction
- B. reflection
- C. accommodation
- D. correction
A Secehi disc is used in the determination of
- A) rainfall
- B) tides
- C) waves
- D) turbidity
Which is the enzyme that begins digestion of starch in the mouth?
- A) Ptyalin
- B) Maltase
- C) Amylase
- 6
The part of the mammalian skin involved in temperature regulation is the
- A. sweat gland
- B. hair papilla
- C. hair follicle
- D. sebaceous gland
Food webs are complex because
- A. the number of producers are large
- B. many animals feed directly on producers
- C. they include primary, secondary and tertiary consumers
- D. some animals form part of several food chains
Lateral meristem in flowering plants is found in the
- A. cortex
- B. pericycle
- C. cambium
- D. pith
(a) Describe briefly the process involved in the breakdown of glucose in the cell of living organisms to produce energy (AT P)
(b) State two conditions under which glycogen can be converted to glucose to produce energy.
(c) Describe an experiment to demonstrate that oxygen is released by green plants during photosynthesis.
Suppose a mutation in an organism's genome produces a malformed version of tRNA synthetase. This malformed version of the enzyme is completely non-functional. What would be the direct effect on the cell producing non-functional tRNA synthetase?
- A. DNA transcription would not be able to proceed.
- B. Amino acids would not bind to tRNA molecules.
- C. The tRNA reserves in the cell would eventually be depleted.
- D. tRNA molecules would not recognize ribosomal binding sites.
The only vein that carriers pure oxygenated blood is the
- A. renal vein
- B. pulmonary vein
- C. hepatic vein
- D. sciatic vein
The organisms with the least number of individuals in a pyramid of numbers are the
- A. secondary consumers
- B. tertiary consumers
- C. primary producers
- D. primary consumers