Life Sciences
GATE XL purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 931–940 of 1235. Imported answers require independent review unless marked reviewed.
Question 6
Open questionXL-SMCQ1 markNeeds review
Secondary metabolites such as penicillin from mold are produced during the __________.
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Open questionXL-SMCQ1 markNeeds review
Dick test is used to assess the susceptibility to __________.
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Open questionXL-SMCQ1 markNeeds review
Which of the following is a symbiotic bacterial genus that converts nitrogen into nitrogen containing compounds that are utilized by legume plants to synthesize amino acids?
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Open questionXL-SMCQ1 markNeeds review
What is the enzyme involved in the following reaction?
Triglyceride + 3H₂O → Glycerol + fatty acids
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Open questionXL-SNAT1 markNeeds review
A bacterial culture contains 500 organisms / mL in the exponential growth phase at 8 am in the morning. If you consider a generation time of 20 minutes, the total number of organisms / mL (round off to the nearest integer) after three hours (i.e. at 11 am in the morning) will be
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Open questionXL-SMCQ2 marksNeeds review
Folic acid synthesis in bacteria is competitively inhibited by sulfonamides. Which of the following essential components is replaced by sulfonamides during the process of folic acid synthesis?
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Open questionXL-SMCQ2 marksNeeds review
Which of the following cellular structures are absent in eukaryotes and are present at least in some prokaryotic organisms?
(i) Respiratory enzymes
(ii) Ribosomes
(iii) Nucleoid
(iv) Internal membranes
(v) Pili
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 13
Open questionXL-SMCQ2 marksNeeds review
Granules are inclusion bodies found in bacteria. Which of the following statements are true about granules?
(i) Granules can be storage vessels for carbohydrates/lipids
(ii) Some granules supply substances for a variety of metabolic processes
(iii) Granules are dissolved in cytoplasm
(iv) Granules are membrane-enclosed structures
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Open questionXL-SMCQ2 marksNeeds review
Match the culture media to their uses.
Culture Media | Uses |
|---|---|
(i) Complex media | (p) identifying certain bacteria from mixed culture |
(ii) Selective media | (q) chemically defined media for growing bacteria |
(iii) Differential media | (r) cultivating fastidious bacteria |
(iv) Enriched media | (s) distinguishing one bacteria from another |
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 15
Open questionXL-SMCQ2 marksNeeds review
Among the following characteristics listed below, select those that are the most appropriate for archaebacteria.
(i) Peptidoglycan containing muramic acid and D-amino acids are present in cell wall
(ii) Long chain branched alcohols (phytanols) bound to glycerol by ether linkages are found in the lipids of cytoplasmic membrane
(iii) First amino acid to initiate new polypeptide chain is N-Formylmethionine
(iv) Translation process is sensitive to the action of diphtheria toxin
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