Zoology Practice Test || Zoology MCQ || Zoology Exam Questions 21-30

Biology Quiz

21. The primary function of lipids in biological system is:

A) Genetic coding B) Structural components of membranes C) Providing a rapid source of energy D) All of the above

22. The main function of the Krebs cycle is to:

A) Break down glucose into energy B) Produce ATP from ADP C) Generate electron carriers for the electron transport chain D) Synthesize glucose from non-carbohydrate sources

23. Assertion (A): Cnidarians have radial symmetry.
Reason (R) : Radial symmetry is an adaptation to a sessile lifestyle.

A) Both A and R are true, and R explains A. B) Both A and R are true, but R does not explain A. C) A is true, but R is false. D) A is false, but R is true.

24. The growth phase which is characterized by the maximum rate of cell division:

A) Lag phase B) Exponential (log) phase C) Stationary phase D) Death phase

25. The antibiotics which inhibits bacterial protein synthesis:

A) Penicillin B) Tetracycline C) Vancomycin D) Rifampicin

26. Which of the following is a characteristic feature of Gram-negative bacteria?

A) Thick peptidoglycan layer B) Stains purple in Gram staining C) Outer membrane containing lipopolysaccharides D) Lack of a cell wall

27. Assertion (A) : Deuterostomes develop the anus first.
Reason (R ) : In deuterostomes, the mouth forms from the blastopore.

A) Both A and R are true, and R explains A. B) Both A and R are true, but R does not explain A. C) A is true, but R is false. D) A is false, but R is true.

28. Which level of organization is characteristic of cnidarians?

A) Cellular level B) Tissue level C) Organ level D) Organ system level

29. The vector which can carry large fragments of DNA:

A) Plasmids B) Bacteriophages C) Cosmids D) Shuttle vector

30. According to the Lyon hypothesis, which of the following is true?

A) Both X chromosomes in females are active. B) One X chromosome in females is randomly inactivated. C) Males have two active X chromosomes. D) The Y chromosome in males is inactive.

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