2026 · Paper 1

Complete GATE XL 2026 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 91–93 of 122. Imported answers require review unless explicitly marked reviewed.

Question 91

Open question

XL-TMSQ1 markNeeds review

Which of the following statements is/are NOT correct about the technique used in molecular biology?

Your answerSelect all correct options. You can choose more than one.

A.

Southern blotting is used to detect specific DNA sequences

B.

Northern blotting is used to detect RNA expression levels

C.

Western blotting is used to detect proteins using antibodies

D.

ELISA is used to detect specific DNA sequences directly without antibodies

Log in to check the answer

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

Question 92

Open question

XL-TNAT1 markNeeds review

Assume that in the oxidative branch of the pentose phosphate pathway, each glucose-6-phosphate molecule generates the following products: 2 molecules of NADPH, 1 molecule of CO₂ and 1 molecule of ribulose-5-phosphate.

If 30 molecules of glucose-6-phosphate enter this pathway, and you randomly draw one molecule from the products of the pathway, the probability that this molecule is NADPH is __________ (round off to one decimal place).

Log in to check the answer

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

Question 93

Open question

XL-TMCQ2 marksNeeds review

Muscle performance is positively correlated with Darwinian fitness. The graph below describes the relationship between mean environmental temperature and muscle performance for two closely related lizard species, one living in temperate areas (solid line) and another living in tropical areas (dashed line). Current mean environmental temperatures are marked with vertical dotted lines at (i) for the temperate species and (ii) for the tropical species. If mean environmental temperatures at both locations increase at a steady rate over time, which one of the following is most likely to occur in the near future?



Your answerChoose one option.

A.

Temperate and tropical species will be negatively impacted to the same extent

B.

Temperate species may be positively impacted but tropical species will be negatively impacted

C.

Temperate species will be negatively impacted but tropical species will be positively impacted

D.

Neither temperate nor tropical species will be impacted

Log in to check the answer

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