Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q82 (NDA-I/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

Consider the following statements : 1. DNA replication takes place when chromatin is opened up. 2. Chromatin organises itself into rod-shaped chromosomes before cell division. 3. Both prokaryotes and eukaryotes have the same process for cell division. Which of the statements given above is/are correct ?

Result
Your answer: —  Â·  Correct: B
Explanation

Statement 1 is correct: DNA replication requires the genetic material to be accessible. Chromatin must decondense or "open up" (forming euchromatin) to allow enzymes like DNA polymerase to access the DNA strands for copying.

Statement 2 is correct: During the initial stages of cell division (prophase), chromatin fibers undergo high-level coiling and condensation to form distinct, rod-shaped structures called chromosomes. This organization ensures that DNA is safely and accurately distributed to daughter cells without entanglement.

Statement 3 is incorrect: Prokaryotes and eukaryotes have fundamentally different cell division processes. Prokaryotes (e.g., bacteria) lack a nucleus and typically divide through binary fission. Eukaryotes, which possess a nucleus and multiple chromosomes, undergo mitosis or meiosis, involving complex phases like spindle formation and nuclear envelope breakdown.

How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
100%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

IAS · 2020 · Q54 Relevance score: -2.23

Consider the following statements : 1. Genetic changes can be introduced in the cells that produce eggs or sperms of a prospective parent. 2. A person's genome can be edited before birth at the early embryonic stage. 3. Human induced pluripotent stem cells can be injected into the embryo of a pig. Which of the statements given above is/are correct ?

IAS · 2019 · Q93 Relevance score: -3.30

With reference to the recent developments in science, which one of the following statements is not correct?

CDS-I · 2021 · Q120 Relevance score: -3.91

Which of the following statements about ‘fission’ is correct ? 1. It is related with the creation of new individuals by means of cell division in unicellular organism. 2. It is related with the transformation of heavier nuclei into smaller nuclei. 3. It is related with the creation of a heavier nuclei by means of combining two higher nuclei. Select the correct answer using the code given below :

IAS · 2021 · Q80 Relevance score: -4.19

Consider the following statements : 1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes. 2. Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus. Which of the statements given above is/are correct?

NDA-I · 2016 · Q31 Relevance score: -4.21

_ Which of the following statements about DNA is/are correct ? 1. DNA is the hereditary material of all living organisms. . 2. All segments of DNA code for synthesis of proteins. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. 4. DNA is also found in mitochondria. Select the correct answer using the code given below: