Biology Past Questions And Answers
Which of the following enzymes is directly associated with polypeptide formation, and has the function of binding amino acids to each other at the ribosome?
- A. tRNA synthetase
- B. Ligase
- C. Peptidyl transferase
- D. ATP synthase
Which of the following is an evolutionary trend commonly observed in organisms?
- A. Decreased complexity over time
- B. Increased dependence on external resources
- C. Increased genetic diversity within populations
- D. Decreased adaptation to the environment
The appendicular skeleton includes
- A. pectoral and pelvic girdles
- B. forelimbs, skull and pectoral girdle
- C. lungs and ribs
- D. skull and the vertebral column
Insects visit flowers in order to
- A. feed on the nectar
- B. deposit pollen on the stigma
- C. pollinate the flowers
- D. transfer pollen from anthers
ai. What are sense organs?
ii. Name three sense organs that respond to the stimulus of chemicals
b. List three animals each that exhibit the following courtship behaviours
i.territoriality ii. pairing
ci. State one similarity between the eggs of toad and the eggs of birds.
ii. State three differences between the eggs of toads and the eggs of birds.
d. Complete the table below by listing four organisms involved in the nitrogen cycle and state one role each of the organisms.
| four organisms involved in nitrogen circle | one role of organism |
e. Complete the table below by naming two types of heterotrophic modes of nutrition in animals and give two examples each of the organisms that carry out the modes of nutrition.
Two modes of heterotrophic nutrition | Two examples of organisms that carry out mode of nutrition |
The name of a bacterium which derives its energy from oxidizing nitrites into nitrates is
- A) nitrosomonas
- B) azotobacter
- C) nitrobacter
- D) Escherichia coli
Fish cannot survive on land because it has
- A. a body covered with scales
- B. a streamlined body
- C. no lungs
- D. no walking appendages
The main structure in vertebrates that supports and protects the body is the
- A. skeleton
- B. ligament
- C. muscle
- D. joint
The part of the mammalian skin involved in excretion is the
- A. sweat glands
- B. malpighian layer
- C. sebaceous gland
- D. horny layer
Which of the following requires the use of carbon dating to prove that evolution has occurred?
- A. Comparative anatomy
- B. Biochemical similarities
- C. molecular records
- D. Fossil records