GATE XL format:mcq PYQs & Answers — Page 24

Questions 231–240 of 812. Imported answers require independent review unless marked reviewed.

Intracellular concentrations of ATP, ADP, and inorganic phosphate in four cell types are given below. Which one of these cell types has the most negative

for ATP hydrolysis?

Cell type	ATP (mM)	ADP (mM)	Inorganic phosphate (mM)
L	3.0	1.8	5.0
K	3.9	1.3	3.0
B	2.7	0.7	2.7
M	7.2	0.9	8.0

Your answerChoose one option.

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Which one of the following amino acids has more than two acid-base groups?

Your answerChoose one option.

Alanine

Leucine

Phenylalanine

Tyrosine

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Enzyme activity profiles as a function of time in the absence or presence of different types of feedback mechanisms are shown in the figure below. Match the following feedback mechanisms with the corresponding profiles in the figure. (p) No feedback mechanism (q) Negative feedback mechanism with short delay (r) Negative feedback mechanism with long delay (s) Positive feedback mechanism

Your answerChoose one option.

(p) – (i); (q) – (ii); (r) – (iii); (s) – (iv)

(p) – (iv); (q) – (iii); (r) – (ii); (s) – (i)

(p) – (iv); (q) – (ii); (r) – (iii); (s) – (i)

(p) – (i); (q) – (iii); (r) – (ii); (s) – (iv)

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A linear DNA fragment of 5 kilobase (kb) when completely digested with EcoRI produces 2.5 kb, 1.5 kb, and 1 kb fragments. Complete digestion of the same 5 kb fragment with XbaI produces 3.5 kb and 1.5 kb fragments. Which one of the following sets of fragments will be obtained if the 5 kb fragment is fully digested with EcoRI and XbaI simultaneously?

Your answerChoose one option.

3 kb and 2 kb

2 kb and 1 kb

2 kb, 1.5 kb, 1 kb, and 0.5 kb

2.5 kb, 1.5 kb, 0.75 kb, and 0.25 kb

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Match the cell types listed in Group I with associated processes listed in Group II. Group I (p) NK cells (q) B cells (r) Mast cells (s) Neutrophils

Group II (i) Antibody production (ii) First cells to be recruited at the site of infection (iii) Antibody-dependent cell-mediated cytotoxicity (iv) Histamine production

Your answerChoose one option.

(p) – (ii); (q) – (i); (r) – (iii); (s) – (iv)

(p) – (ii); (q) – (i); (r) – (iv); (s) – (ii)

(p) – (iii); (q) – (i); (r) – (iv); (s) – (ii)

(p) – (iii); (q) – (ii); (r) – (i); (s) – (iv)

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Which one of the following statements on Casparian strips is correct?

Your answerChoose one option.

Casparian strips are specific to vascular plants found in epidermal cells.

Casparian strips are modifications mostly found in shoot tissue.

Casparian strips act as a cellular barrier to allow selective nutrient uptake and exclusion of pathogens.

Casparian strips are common in root endodermal cells of non-vascular plants.

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Rotenone is a chemical often used to kill insect pests on crop plants and fishes in lakes. Rotenone acts by inhibiting electron transport from the NADH dehydrogenase enzyme in Complex I to ubiquinone in the mitochondrial electron transport chain. Which one of the following explains why plants can tolerate rotenone application?

Your answerChoose one option.

The Complex I in plants is resistant to rotenone.

Plants inactivate rotenone by enzymatic degradation.

Plants have specific channels that efflux rotenone out of the cell.

Plants have additional NAD(P)H dehydrogenases that are resistant to rotenone.

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Although Pseudomonas syringae infection in plants is actively inhibited by the endogenous salicylic acid (SA) of host origin, a successful infection is still established because the bacterium secretes coronatine, an effector molecule. Which one of the following best describes the mode of action of coronatine?

Your answerChoose one option.

Coronatine inhibits SA biosynthesis.

Coronatine promotes the biosynthesis of jasmonic acid (JA), and JA signal in turn inhibits SA response.

Coronatine is a structural analogue of SA, which binds to the SA receptor and inhibits its function.

Coronatine is a structural analogue of jasmonic acid (JA), which activates JA signaling to inhibit SA response.

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The schematic depicts an unexpanded plant cell within a hypocotyl with the arrangement of cellulose microfibrils marked on its cell wall.

Which one of the following shapes would most likely result from the expansion of this cell if the pattern of the cellulose fibers does not change?

Your answerChoose one option.

Diagram for Life Sciences question 50 (figure 2)

Diagram for Life Sciences question 50 (figure 3)

Diagram for Life Sciences question 50 (figure 4)

Diagram for Life Sciences question 50 (figure 5)

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Match the tasks given in Group I with the associated techniques conventionally used as listed in Group II.

Group I P. Ploidy analysis Q. Profiling DNA methetion R. Identifying non-coding RNAs S. Identifying SNPs T. Satellite DNA isolation

Group II

RNA sequencing

Exome sequencing

Fluorescence in situ hybridization

Bisulfite sequencing

Density-gradient centrifugation

Your answerChoose one option.

P-2; Q-1; R-3; S-4; T-5

P-3; Q-4; R-1; S-2; T-5

P-5; Q-4; R-1; S-2; T-3

P-3; Q-5; R-1; S-2; T-4

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GATE XL format:mcq PYQs

Question 36

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Question 50

Question 55