GATE XL year:2020 PYQs & Answers — Page 5

Questions 41–50 of 125. Imported answers require independent review unless marked reviewed.

Topic practice 125 questionsPage 5 of 13

A solution absorbs 20% of the incident light in a cuvette of path length 1.0 cm. The amount of light transmitted by the same solution in a cuvette of 3.0 cm path length is ________% (rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The second pKa of phosphoric acid is 6.8. The ratio of Na₂HPO₄ to NaH₂PO₄ required to obtain a buffer of pH 7.0 is ________ (rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A PCR in a 100 μL reaction volume, containing two primers at a concentration of 0.2 μM each, is set up to amplify a 250 base pair DNA fragment. Consider the average molecular weight of one base pair as 660 Da. If the primers are fully consumed by the end of the reaction, the amount of the final PCR product formed is __________ μg (rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

An enzyme obeying Michaelis-Menten kinetics shows a reaction velocity (v) of 10 μmol/min when the substrate concentration [S] equals its Kₘ. The maximal velocity Vₘₐₓ for this enzyme is ______ μmol/min (correct to integer number).

(Kₘ is Michaelis-Menten constant)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The enzyme glucose isomerase catalyses the inter-conversion of glucose and fructose as shown.

Glucose ⇌ Fructose

The ΔG′₀ for this reaction is zero kcal/mol. After adding glucose isomerase to a 0.12 M glucose solution and allowing the reaction to attain equilibrium, the final concentration of fructose in the reaction mixture will be ______ mM.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Indefinite stamen is a characteristic feature of which of the following plant families?

Your answerChoose one option.

Malvaceae

Apocynaceae

Poaceae

Brassicaceae

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In natural condition, which of the following plants DOES NOT exhibit anomalous secondary growth?

Your answerChoose one option.

Rice

Aloe

Yucca

Dracaena

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a typical angiosperm under natural condition, primary meristems are usually established during

Your answerChoose one option.

Gametogenesis

Embryogenesis

Vegetative phase development

Secondary growth

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

2-Methoxy-3, 6-dichlorobenzoic acid belongs to which class of plant growth regulators?

Your answerChoose one option.

Synthetic auxin

Synthetic cytokinin

Strigolactone

Brassinosteroid

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a typical green plant, the first stable product of Calvin cycle is

Your answerChoose one option.

Oxaloacetic acid

Succinic acid

Maleic acid

3-Phosphoglyceric acid

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XL year:2020 PYQs

Question 16

Question 17

Question 18

Question 19

Question 20

Question 1

Question 2

Question 3

Question 4

Question 5