Class 12 Biology · Chapter 7 · Test 1
Chromosomes and DNA
40 MCQs
40 questions · 35 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Which of the following looks like beads on a string?
- AChromosomes
- BChromatin
- CNucleosomes
- DHeterochromatin
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Answer: C
Nucleosomes without the linker histone resemble beads on a string called the nucleosome string.
Question 2
The most convincing proof that DNA is the genetic material was provided by:
- AMendel
- BMorgan
- CHershey & Chase
- DMeselson and Stahl
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Answer: C
Hershey and Chase showed that the DNA of bacteriophages and not the protein directs the production of new phages.
Question 3
Eukaryotic chromosomes are made of:
- ADNA and histone proteins
- BRNA and lipids
- CDNA and carbohydrates
- DRNA and histones only
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Answer: A
Chromosomes are thin thread-like structures made of DNA and histone proteins.
Question 4
The complete set of chromosomes of a species is called its:
- AGenome
- BKaryotype
- CGenotype
- DChromatin
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Answer: B
The number and shape of chromosomes differ in each species and the complete set is the karyotype.
Question 5
Homologous chromosomes occur in pairs in:
- AGametes
- BSomatic cells of diploid organisms
- CSperm only
- DEggs only
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Answer: B
Body cells of diploid organisms have chromosomes in homologous pairs.
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