GATE XL topic:life-sciences PYQs & Answers — Page 4

Questions 31–40 of 1235. Imported answers require independent review unless marked reviewed.

Which of the following options show(s) the correct pairing of a complement protein with its function?

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

C5a : inflammation

C3b : opsonization

C3a : opsonization

C5b : inflammation

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Fluorescence is a result of which one or more of the following?

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

The transition of electrons from singlet ground state to singlet transition state.

The transition of electrons from lower singlet excited state to singlet ground state.

The release of energy in the form of light of wavelength higher than the incident wavelength.

The release of energy in the form of light of lower wavelength than the incident wavelength.

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A 25 amino acid α-helical protein is spanning the thickness of a mammalian cell membrane. Using the average dimensional parameters of a typical α-helix, the thickness of the membrane will be _____ Å (rounded off to one decimal place).

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The oxidative phase of the hexose monophosphate pathway generates __________ moles of NADPH per mole of glucose 6-phosphate (answer in integer).

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Partial double digestion of the DNA shown below with EcoRI, and XhoI will yield _____ bands after gel electrophoresis (answer in integer).

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Chymotrypsin cleaves polypeptides preferentially on the carbonyl side of aromatic, and some other bulky nonpolar residues. Trypsin cleaves on the carbonyl side of positively charged residues. Digestion of a polypeptide having the composition-Ala₂, Gly, Lys₂, Phe, Thr, Trp, Val, independently by these two proteases yielded peptide fragments as shown below.

Trypsin	Chymotrypsin
1. Ala-Ala-Trp-Gly-Lys	1. Gly-Lys
2. Thr-Phe-Val-Lys	2. Thr-Phe
	3. Val-Lys-Ala-Ala-Trp

Which one of the following is the correct primary structure of the polypeptide?

Your answerChoose one option.

Ala-Ala-Trp-Gly-Lys-Lys-Thr-Phe-Val

Thr-Phe-Val-Lys-Ala-Ala-Trp-Gly-Lys

Val-Lys-Ala-Ala-Trp-Gly-Lys-Thr-Phe

Thr-Phe-Ala-Ala-Trp-Val-Lys-Gly-Lys

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Which one of the following enzymes is NOT inhibited by glucose-6-phosphate?

Your answerChoose one option.

Hexokinase I

Hexokinase II

Hexokinase III

Hexokinase IV

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The following diagram represents energy states of different protein folding steps, which includes-

Folded

Transition

Molten globule

Unfolded

Find the correct match of folding steps (1 to 4) with the energy state (P to S) in the diagram.

Your answerChoose one option.

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

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

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

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

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The correct path of transfer of electrons in the light harvesting photosystems in vascular plants is _________.

Your answerChoose one option.

H₂O → Photosystem II → Cyt b₆f → Photosystem I → NADP⁺

H₂O → Photosystem I → Cyt b₆f → Photosystem II → O₂

H₂O → Photosystem II → Cyt b₆f → Photosystem I → O₂

H₂O → Photosystem I → Cyt b₆f → Photosystem II → NADP⁺

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For a simple enzyme that follows Michaelis-Menten kinetics, kinetic data was collected in the absence (dotted line, -I) or presence (solid line, +I) of an uncompetitive inhibitor (I). Which one of the following Eadie-Hofstee plots best describes the expected result?

(

= initial velocity, [S] = free substrate concentration)

Your answerChoose one option.