Life Sciences
GATE XL topic:life-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 691–700 of 1235. Imported answers require independent review unless marked reviewed.
Question 16
Open questionXL-SMCQ2 marksNeeds review
The rate of appearance of recombinant E. coli strains containing different genes after a mating between Hfr and F⁻ strains is shown in the graph (left). The approximate location of different genes (p, q, r, s, t, x, and y) along the Hfr chromosome is also shown (right). Based on this information, identify the recombinants X, Y and Z.
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Open questionXL-SNAT2 marksNeeds review
The genome of a bacterium encodes for 10 different surface antigens, whose expression can be turned ‘ON’ or ‘OFF’ randomly and independently. The number of possible antigenic combinations is __________.
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Open questionXL-SNAT2 marksNeeds review
Suppose the mRNAs in a newly discovered bacteria are composed of only two distinct nucleotides (as opposed to four found in all known organisms). Considering that the organism has no nucleotide modification systems, the number of nucleotides required per codon to encode at least 20 distinct amino acids will be __________.
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Open questionXL-SNAT2 marksNeeds review
The decimal reduction time (D) for reducing 10¹² spores of Clostridium botulinum to 1 spore at 111°C will be ______ min (in integer). The D value is 0.2 min at 121°C. The increase in temperature required to change D to 1/10ᵗʰ of its initial value (Z value) is 10°C.
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Open questionXL-SNAT2 marksNeeds review
The generation time of E. coli is 30 minutes. For an exponentially growing culture, the initial number of bacteria required to reach a number of 10⁹ in 2 hours is __________×10⁷ (round off to two decimal places).
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Open questionXL-TMCQ1 markNeeds review
Ichthyophis belongs to which of the following Class?
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The two homologous genes occurring in different species are called
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The expression of holandric genes causes which of the following genetic trait in humans?
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Assume that the anticodon for an unknown amino acid is 3′ AUG 5′. The corresponding code on DNA sequence would be
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Open questionXL-TMCQ1 markNeeds review
The Organ of Corti is found in which of the following parts of human body?
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