NEET-UG Biology

Nucleus, chromatin and chromosome types — practice questions

5 questions in the bank on this idea. Below are 5 of them, exactly as they appear in a test.

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Question 1 · difficulty L1 · recall
Which nuclear structure is the main site of ribosomal RNA synthesis and ribosome-subunit assembly?
- A. Nucleolus
- B. Nuclear pore
- C. Centromere
- D. Chromatid
Question 2 · difficulty L2 · understanding
What is chromatin?
- A. DNA associated with proteins in the nucleus
- B. A membrane surrounding the nucleus
- C. A stack of ribosomes
- D. A component of the Golgi apparatus
Question 3 · difficulty L2 · understanding
How does a metacentric chromosome differ from an acrocentric chromosome?
- A. A metacentric chromosome has a centrally placed centromere, while an acrocentric chromosome has the centromere near one end
- B. A metacentric chromosome lacks a centromere
- C. An acrocentric chromosome always has equal arms
- D. A metacentric chromosome occurs only in prokaryotes
Question 4 · difficulty L3 · application
A chromosome observed at metaphase has two sister chromatids joined at a constricted region. What is this constricted region?
- A. Centromere
- B. Nucleolus
- C. Nuclear pore
- D. Telomere
Question 5 · difficulty L5 · analysis
Chromosome P has two nearly equal arms, Q has one arm distinctly shorter than the other, and R has the centromere very close to one end, producing a very short arm. Which sequence best matches their types?
- A. Metacentric, submetacentric, acrocentric
- B. Submetacentric, metacentric, telocentric
- C. Acrocentric, metacentric, submetacentric
- D. Metacentric, acrocentric, submetacentric

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