In prokaryotes:

(1) A typical nucleus is not seen and DNA is scattered throughout the cell

(2) A typical nucleus may sometimes be present and DNA is scattered throughout a cell

(3) A typical nucleus is not seen but DNA is not scattered throughout the cell

(4) A typical nucleus may sometimes be present but DNA is not scattered throughout the cell

Subtopic:  DNA Packaging |
 61%
From NCERT
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Histones are rich in amino acids:

(1) Arginine and Lysine

(2) Argine and Leucine

(3) Arginine and Isoleucine                                

(4) Aspartate and Glutamate

Subtopic:  DNA Packaging |
 95%
From NCERT
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A typical nucleosome unit consists of about:

1. 60 base pairs

2. 140 base pairs

3. 200 base pairs 

4. 400 base pairs

Subtopic:  DNA Packaging |
 93%
From NCERT
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During DNA packaging in eukaryotic cells, Non Histone Chromosomal proteins:

1. Are not required

2. Are required from the beginning to the end of packaging

3. Are required only for earlier stages of packaging

4. Are required for higher level of packaging

Subtopic:  DNA Packaging |
 80%
From NCERT
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Frederick Griffith discovered:

(1) DNA is the genetic material

(2) RNA can be the genetic material

(3) Sterptococcus has two strains

(4) Bacterial transformation

Subtopic:  Search for Genetic Material:I | Search for Genetic Material |
 71%
From NCERT
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In Avery, Macleod and McCarty experiment, the transformation of bacteria was inhibited by:

(1) Proteases

(2) RNase

(3) DNAs

(4) None of these

Subtopic:  Search for Genetic Material: II | Search for Genetic Material |
From NCERT
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Viruses grown on radioactive sulfur contain:

(1) Radioactive proteins but not DNA

(2) Radioactive DNA but not proteins

(3) Radioactive proteins and DNA

(4) Nonradioactive DNA and protein

Subtopic:  Search for Genetic Material: II | Search for Genetic Material |
 85%
From NCERT
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Hershey and Chase proved DNA as the genetic material as in their experiment:

(1) Bacteria that were infected with viruses that had radioactive proteins were not radioactive

(2) Bacteria that were infected with viruses that had radioactive DNA were radioactive

(3) Both 1 and 2 are correct

(4) Both 1 and 2 are incorrect

Subtopic:  Search for Genetic Material: II | Search for Genetic Material |
 72%
From NCERT
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RNA is not the genetic material in:

1. Tobacco mosaic virus

2. QB bacteriophage

3. HIV

4. Archaebacteria

Subtopic:  DNA vs RNA as Genetic Material |
 75%
From NCERT
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DNA is structurally and chemically more stable than RNA because of all the following except:

(1) It has thymine instead of uracil

(2) 2’ –OH is absent in DNA

(3) It replicates itself based on complementary base pairing

(4) It does not have any catalytic role

Subtopic:  DNA vs RNA as Genetic Material |
From NCERT
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