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Botany NEET Questions — Free MCQ Practice

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If Hershey and Chase had found 'S in both the pellet and the supernatant, the conclusion about the nature of DNA replication would be that:

A.

Protein must be the information molecule

B.

It would be difficult to conclude anything from these results

C.

DNA is the genetic information molecule

D.

Phage must have stuck to the bacteria

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Explanation

The information provided in the question is incomplete as we cannot infer anything from presence of Sulphur in pellet and supernatant.

If it would have been Phosphorus, then we could say that genetic material has transferred.

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Experiments by Avery, Macleod, and McCarty supported DNA as the genetic material by showing that:

A.

Both protein and DNA samples provided the transforming factor

B.

DNA was not complex enough to be the genetic material

C.

Only samples with DNA provided transforming activity

D.

Even though DNA was molecularly simple, it provided adequate variation to act as the genetic material

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Explanation

Avery, Macleod and McCarty purified biochemicals (proteins, DNA, RNA, etc.) from the heat-killed S cells to see which ones could transform live R cells into S cells. They discovered that DNA alone from S bacteria caused R bacteria to become transformed.

They concluded that DNA is the hereditary material.

(page-101)

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What are the mini-satellites?

A.

r-DNA

B.

VNTR

C.

c-DNA

D.

SAT

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Explanation

The VNTR belongs to a class of satellite DNA referred to as mini-satellite. A small DNA sequence is arranged tandemly in many copy numbers.

(page-122)

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Which statement about complementary base pairing is not true?

A.

It plays a role in DNA replication

B.

In DNA, T pairs with A

C.

Purines pair with purines, and pyrimidines pair with pyrimidines

D.

In DNA, C pairs with G

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Explanation

All statements are correct except (c).

Purines always pair with pyrimidines. This generates uniform distance between two strands of helix.

(page-97)

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Western Blot hybridization is used for:

A.

DNA analysis

B.

RNA analysis

C.

Protein analysis

D.

Polysaccharide analysis

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Explanation

Western Blotting: Protein analysis

Northern Blotting: RNA analysis

Southern Blotting: DNA analysis

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SNP which is pronounced as "snips” stands for:

A.

Small nuclear protein

B.

Single nucleotide particle

C.

Single nucleotide polymorphism

D.

Small nicking points

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Explanation

(page-122)

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The length of E. coli DNA and length of DNA in a human 2N cell is:

A.

1.36 mm and 2.2 m respectively

B.

1.36 mm and 2.2 mm respectively

C.

1.3 ìm and 2.2 ìm respectively

D.

1.36 cm and 2.2 cm respectively

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Explanation

The length of DNA double helix in a typical mammalian cell is 2.2 metres.

It is calculated by multiplying the total number of bp with distance between two consecutive bp.

= 6.6 × 109 bp × 0.34 × 10^-9m/bp

= 2.2 metres.

In E.coli, the length of DNA is 1.36 mm.

(page-99)

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To obtain a virus free plant, what can be used as an explant in micropropogation ?

A.

Apical meristem

B.

Axillary meristem

C.

Either apical or axillary meristem

D.

Embryo

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Explanation

Page 177, XII NCERT

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Meristem culture is especially important to obtain:

A.

Drought resistant plants

B.

Virus free plants

C.

Biofortified plants

D.

Androgenic haploids

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Explanation

Read page 177, XII NCERT

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Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

A.

Bacterial leaf blight of rice

B.

Downy mildew of grapes

C.

Loose smut of wheat

D.

Black rust of wheat

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Explanation

Bordeaux mixture was discovered by Millardet in France in 1882. It is prepared by dissolving 40 g of copper sulphate and 40 g of calcium hydroxide in 5 L of water. It was first used to control downy mildew disease of grape-vine that is caused by a fungus Plasmopara viticola. Black rust of wheat is caused by Puccinia graminis tritici. The use of fungicide Dithane

Z-78 and Dithane M-45 control the disease even at lower concentration.

Loose smut of wheat is caused by Ustilago tritici. The use of fungicides (systemic fungicide like D-735 and F-461) give quite encouraging result.

Botany MCQs for NEET — Practice Questions with Answers

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