GATE XL year:2023 PYQs & Answers — Page 10

Questions 91–100 of 122. Imported answers require independent review unless marked reviewed.

In a population of 1000 wild dogs in a grassland, 360 and 480 dogs had black body colour with genotypes BB and Bb, respectively. In the same population, remaining dogs were white in colour with a genotype of bb. Based on this data, the frequency of allele “b” in the population is ______ (round off to one decimal place).

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A mature rat sperm cell has 2.5 μg of genomic DNA that is equivalent of a haploid genome. Compared to this sperm cell, the amount of genomic DNA (in μg) in a somatic cell, which is in the G2 phase of cell cycle, will be ______ (in integer).

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In an experiment, excess amount of bicoid mRNA (more than wild-type expression level) was injected into the posterior pole of a wild-type Drosophila embryo at pre-blastodermal stage. Out of the following options, which one represents the best expected phenotype in the resulted developing embryo?

Your answerChoose one option.

Normal embryo with head structure at anterior and tail structure at posterior pole

Head structure only at posterior pole of the embryo

Tail structure at anterior and head structure at posterior poles of the embryo

Head structure at both anterior and posterior poles of the embryo

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Match the hormones/precursors listed in Column I with their chemical type in Column II and the tissue of origin listed in Column III

Column I: P. Glucagon; Q. Pregnenolone; R. FSH; S. Melatonin

Column II: (i) Tryptophan derivative; (ii) Peptide; (iii) Steroid; (iv) Glycoprotein

Column III: a. Anterior pituitary; b. Pineal; c. Adrenal; d. Pancreas

Your answerChoose one option.

P – (ii) – d ; Q – (iii) – c ; R – (iv) – a ; S – (i) – b

P – (ii) – d ; Q – (iv) – a ; R – (i) – c ; S – (iii) – b

P – (i) – c ; Q – (ii) – b ; R – (iv) – d ; S – (iii) – a

P – (iv) – a ; Q – (i) – d ; R – (ii) – b ; S – (iii) – c

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Match the syndromes listed in Column I with the cause/symptoms listed in Column II

Column I: P. Prader-Willi syndrome; Q. Down syndrome; R. Cushing syndrome; S. Turner syndrome; T. Fanconi syndrome

Column II: (i) a collection of signs and symptoms due to prolonged exposure to corticosteroids like cortisol; (ii) a syndrome of inadequate reabsorption in the proximal renal tubule of the kidney; (iii) a genetic disorder usually caused by the deletion of a part of chromosome 15; (iv) a genetic disorder caused by the presence of all or part of a third copy of chromosome 21; (v) a genetic condition in which a female has partially or completely missing an X chromosome

Your answerChoose one option.

P – (ii) ; Q – (v) ; R – (iv) ; S – (iii) ; T – (i)

P – (iv) ; Q – (ii) ; R – (i) ; S – (iii) ; T – (v)

P – (iii) ; Q – (iv) ; R – (i) ; S – (v) ; T – (ii)

P – (v) ; Q – (iv) ; R – (ii) ; S – (i) ; T – (iii)

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Match the immunological statements in Column I with the appropriate descriptions from Column II

Column I: P. Active acquired immunity; Q. First line of defense; R. Passive natural immunity; S. Second line of defense

Column II: (i) Complement proteins and interferons; (ii) Direct contact with pathogens that enter the body; (iii) Surface barriers; (iv) Antibodies pass through placenta

Your answerChoose one option.

P – (ii) ; Q – (iii) ; R – (iv) ; S – (i)

P – (iv) ; Q – (iii) ; R – (i) ; S – (ii)

P – (iv) ; Q – (ii) ; R – (iii) ; S – (i)

P – (i) ; Q – (iv) ; R – (iii) ; S – (ii)

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Match the standard/stated cofactors in Column I with their respective enzymes in Column II

Column I P. Cu²⁺ Q. Se R. Ni²⁺ S. K⁺ T. Mo

Column II (i) Dinitrogenase (ii) Cytochrome oxidase (iii) Pyruvate kinase (iv) Glutathione peroxidase (v) Urease

Your answerChoose one option.

P – (v) ; Q – (ii) ; R – (iv) ; S – (i) ; T – (iii)

P – (ii) ; Q – (iv) ; R – (v) ; S – (iii) ; T – (i)

P – (iv) ; Q – (ii) ; R – (iii) ; S – (i) ; T – (v)

P – (ii) ; Q – (i) ; R – (iii) ; S – (iv) ; T – (v)

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The presence of excess glucose has been known to prevent the induction of lac operon as well as other operon controlling enzymes involved in carbohydrate metabolism in E. coli. Which of the following processes define(s) the phenomenon?

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

Catabolite repression

Attenuation

Glucose effect

Feedback inhibition

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Which of the following techniques is/are used for determining the three-dimensional structure of proteins?

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

Cryo-electron Microscopy

Circular Dichroism

Nuclear Magnetic Resonance Spectroscopy

X-ray Diffraction

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Among the following statements, which is/are TRUE regarding the replication of DNA?

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

Replication is bidirectional and conservative in nature.

Replication in eukaryotes takes place at multiple Ori sites simultaneously.

Both the strands replicate in discontinuous manner.

One strand replicates in continuous while the other replicates in discontinuous manner.

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GATE XL year:2023 PYQs

Question 91

Question 92

Question 93

Question 94

Question 95

Question 96

Question 97

Question 98

Question 99

Question 100