Life Sciences
GATE XL topic:life-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 901–910 of 1235. Imported answers require independent review unless marked reviewed.
Question 16
Open questionXL-QMCQ2 marksNeeds review
The crystal structure of a peptide has an ordered structural repeat of amino acids with a distance of ~ 6.5 Å between the alternate Cα atoms. Which one of the following pair of dihedral angles (Φ and Ψ) accurately represents the peptide structure?
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Absence of detectable protein expression upon blunt-ended mutation-free cloning of an E.coli gene with its own promoter in E. coli cells can be due to
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The C-terminal carboxyl group and the N-terminal amino group in amino acids have a dissociation constant (pKₐ) of 2.2 and 9.2, respectively. The pKₐ of side chain carboxyl group in glutamic acid is 4.2 and side chain amino group in lysine is 10.2. The difference in isoelectric point (pI) of lysine and glutamic acid (rounded off to two decimal places) is _____.
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X different sized DNA fragments can be observed upon incomplete EcoRI digestion of identical DNA molecules with two EcoRI sites as shown below. The maximum value of X is _____.
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An uncharged protein (P) has an Asp in position 23 with a molecular weight of 6501 Da, as determined by mass spectrometry. The uncharged mutant of this protein (P′) contains a single amino acid substitution with Asn at position 23. The molecular weight of P′, as determined by mass spectrometry (rounded off to one decimal place) is ____Da.
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Which one of the following ecosystems is represented by an inverted pyramid of numbers?
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Raphides are deposits of
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Which one of the following families shows bicollateral vascular bundle in the transverse section of the stem?
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Arbuscules are highly branched structures, formed by
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Which one of the following combinations of polysaccharides is present in plant cell wall?
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