GATE BT year:2020 PYQs & Answers — Page 5

Questions 41–50 of 65. Imported answers require independent review unless marked reviewed.

In tomato plant, red (R) is dominant over yellow (r) for fruit color and purple (P) is dominant over green (p) for stem color. Fruit color and stem color assort independently. The number of progeny plants of different fruit-stem colors obtained from a mating are as follows:

Red fruit, purple stem – 145

Red fruit, green stem – 184

Yellow fruit, purple stem – 66

Yellow fruit, green stem – 47

What are the genotypes of the parent plants in this mating?

Your answerChoose one option.

RrPp × Rrpp

RrPp × RrPp

RRPP × rrpp

RrPP × Rrpp

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Some of the cytokinins used in plant tissue culture media are given below:

[P] BAP

[Q] Zeatin

[R] Kinetin

[S] 2iP

Which of these are synthetic analogs?

Your answerChoose one option.

P and Q only

Q and S only

R and S only

P and R only

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Carl Woese used the gene sequence of which one of the following for phylogenetic taxonomy of prokaryotes?

Your answerChoose one option.

A ribosomal RNA of large ribosomal subunit

A ribosomal RNA of small ribosomal subunit

A ribosomal protein of large ribosomal subunit

A ribosomal protein of small ribosomal subunit

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A list of pathogens (Group I) and a list of anti-microbial agents (Group II) used to treat their infections are given below. Match the pathogens with the corresponding anti-microbial agents.

Group I	Group II
[P] Influenza A virus	1. Isoniazid
[Q] Fungus	2. Amantadine
[R] Plasmodium	3. Fluconazole
[S] Mycobacterium	4. Artemisinin
	5. Iodoquinol

Your answerChoose one option.

P-4, Q-3, R-2, S-5

P-5, Q-2, R-4, S-1

P-2, Q-3, R-4, S-1

P-2, Q-3, R-1, S-5

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: Dam methylase protects E. coli DNA from phage endonucleases

Reason [r]: E. coli Dam methylase methylates the adenosine residue in the sequence “GATC”

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is false but [r] is true

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: Embryonic stem cells are suitable for developing knockout mice

Reason [r]: Homologous recombination is more frequent in embryonic stem cells than that in somatic cells

Your answerChoose one option.

Both [a] and [r] are false

Both [a] and [r] are true, and [r] is the correct reason for [a]

Both [a] and [r] are true, but [r] is not the correct reason for [a]

[a] is true, but [r] is false

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The schematic of a plasmid with a gap in one of the strands is shown below:

Which of the following enzyme(s) is/are required to fill the gap and generate a covalently closed circular plasmid?

[P] DNA ligase

[Q] Alkaline phosphatase

[R] DNA polymerase

[S] Polynucleotide kinase

Your answerChoose one option.

P only

P, R and S only

P and R only

P, Q and R only

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Match sub-cellular organelles listed in Group I with their features listed in Group II:

Group I	Group II
[P] Mitochondrion	1. Single-membrane enclosed
[Q] Chloroplast	2. Double-membrane enclosed
[R] Nucleus	3. Maternal inheritance
[S] Endoplasmic reticulum	4. Endosymbiotic origin

Your answerChoose one option.

P-1, Q-4, R-2, S-3

P-2, Q-3, R-4, S-1

P-3, Q-4, R-2, S-1

P-3, Q-1, R-4, S-2

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Which of the following strategies are used by cells for metabolic regulation?

[P] Phosphorylation - dephosphorylation

[Q] Allostery

[R] Feedback inhibition

Your answerChoose one option.

P and Q only

P and R only

Q and R only

P, Q and R

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: A zygote and its immediate descendant cells are unspecialized and are called totipotent

Reason [r]: Totipotent cells retain the capacity to differentiate into only a few cell types

Your answerChoose one option.

Both [a] and [r] are false

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are true and [r] is the correct reason for [a]

[a] is true but [r] is false

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GATE BT year:2020 PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40