SSC CGL Science – Cell & Tissues – Tier II Level · Marathon

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SSC CGL Science – Cell & Tissues – Tier II Level · Marathon – 10 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
In a 24-hour human cell cycle the M phase lasts about 1 hour. Interphase therefore takes about what share of the cycle?

Correct Answer: D [About 96%]

Explanation:

23/24 ≈ 0.96 → about 96% (NCERT: more than 95%).

2.  
During which stage of mitosis do the chromosomes line up at the equator of the cell?

Correct Answer: A [Metaphase]

Explanation:

Metaphase plate = equator; best stage to study chromosome shape.

3.  
DNA replication takes place in which phase of the cell cycle?

Correct Answer: B [S phase]

Explanation:

S = synthesis of DNA; chromosome number does not change.

4.  
The 80S ribosome of a eukaryotic cell is made of which two subunits?

Correct Answer: C [60S and 40S]

Explanation:

Eukaryotic 80S = 60S + 40S; prokaryotic 70S = 50S + 30S (S values do not add).

5.  
The fluid mosaic model of the plasma membrane was proposed by:

Correct Answer: C [Singer and Nicolson]

Explanation:

Answer: Singer and Nicolson. Singer and Nicolson, 1972.

6.  
Arrange in orderArrange the stages of mitosis in the correct order:

Correct Answer: D [Prophase → Metaphase → Anaphase → Telophase]

Explanation:

Please Meet At Teatime: P → M → A → T.

7.  
Crossing over between homologous chromosomes occurs during:

Correct Answer: B [Prophase I of meiosis]

Explanation:

Crossing over happens in prophase I (meiosis I).

8.  
In an organism with 2n = 48, a sperm fertilises an egg. Which is correct?

Correct Answer: A [Each gamete has 24; the zygote has 48]

Explanation:

Meiosis gives n = 24; fertilisation restores 24 + 24 = 48.

9.  
In plant cells, the cytoplasm divides (cytokinesis) mainly by:

Correct Answer: C [cell plate formation]

Explanation:

Rigid wall → cell plate from the centre; animal cells form a furrow.

10.  
Statement-basedWhich is/are correct?
I. Centromeres split during anaphase.
II. The nuclear envelope re-forms during telophase.

Correct Answer: B [Both I and II]

Explanation:

Anaphase – chromatids to poles; telophase – nuclei re-form.

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