Which of the following statements about the cell cycle is correct? MCQ with Answer and Explanation

Which of the following statements about the cell cycle is correct?
A. DNA replication occurs during the G2 phase.
B. Mitosis is the longest phase of the cell cycle.
C. Cytokinesis occurs before prophase.
D. The S phase is when DNA synthesis occurs.
Answer: Option D
Solution (By JKSSB Mock Tests)
In the S (synthesis) phase of interphase, DNA is replicated. G2 is preparation for mitosis. Interphase is the longest. Cytokinesis follows telophase.

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Practice More Biology Questions

Question #1
The hormone that promotes the development of the corpus luteum after ovulation is:
A. LH
B. Estrogen
C. Prolactin
D. FSH

Correct Answer: Option A


Explanation:
Luteinizing hormone (LH) triggers ovulation and then promotes the formation and maintenance of the corpus luteum from the ruptured follicle. The corpus luteum secretes progesterone. FSH stimulates follicle growth, prolactin milk production, estrogen from follicles.

This question belongs to: Science Biology
Question #2
The process by which plants release oxygen is:
A. Respiration
B. Nitrogen fixation
C. Photosynthesis
D. Transpiration

Correct Answer: Option C


Explanation:
During photosynthesis, water is split (photolysis), releasing oxygen as a byproduct. Respiration consumes oxygen, nitrogen fixation uses nitrogenase, transpiration releases water vapor.

This question belongs to: Science Biology
Question #3
The process of eliminating undigested food from the body is:
A. Assimilation
B. Digestion
C. Egestion
D. Absorption

Correct Answer: Option C


Explanation:
Egestion (defecation) is the removal of undigested solid waste from the digestive tract. Absorption is uptake of nutrients, assimilation is incorporation into cells, digestion is breakdown of food.

This question belongs to: Science Biology