Practice Library
All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Correct Answer: C. Mitosis produces daughter nuclei with the same chromosome number as the parent nucleus
Explanation:
Mitosis preserves chromosome number and supports growth and tissue repair.
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Correct Answer: B. The phospholipid bilayer is selectively permeable and contains functional proteins
Explanation:
Cell membranes are phospholipid bilayers with proteins that regulate transport and signalling.
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Correct Answer: B. Allele frequencies can change through selection, drift, mutation and gene flow
Explanation:
Several evolutionary forces alter allele frequencies; drift is especially influential in small populations.
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Correct Answer: A. Energy decreases between trophic levels because much is lost as heat and metabolic work
Explanation:
Matter cycles, but usable energy flows through ecosystems and declines at successive trophic levels.
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Correct Answer: D. Memory lymphocytes enable a faster and stronger response after re-exposure to an antigen
Explanation:
Adaptive immunity forms antigen-specific memory cells, the basis of vaccination.
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Correct Answer: B. Negative feedback counteracts deviations from a physiological set range
Explanation:
Negative-feedback systems detect deviations and activate responses that restore a regulated range.
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Correct Answer: B. Indirect taxes can be collected through transactions while the economic burden may be passed through prices
Explanation:
Indirect-tax systems distinguish legal collection obligations from economic incidence.
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Correct Answer: D. Tax liability is calculated from the legally defined base after applicable inclusions, deductions and adjustments
Explanation:
Tax computation begins with the statutory base and applies current rules; stated hypothetical rates are for practice only.
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Correct Answer: D. Contemporaneous records support the calculation, timing and business purpose of a tax position
Explanation:
Documentation is central to substantiating taxable events, deductions and reporting positions.
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Correct Answer: D. Indirect taxes can be collected through transactions while the economic burden may be passed through prices
Explanation:
Indirect-tax systems distinguish legal collection obligations from economic incidence.
Choose an option to check your answer.
Correct Answer: B. Tax liability is calculated from the legally defined base after applicable inclusions, deductions and adjustments
Explanation:
Tax computation begins with the statutory base and applies current rules; stated hypothetical rates are for practice only.
Choose an option to check your answer.
Correct Answer: C. Contemporaneous records support the calculation, timing and business purpose of a tax position
Explanation:
Documentation is central to substantiating taxable events, deductions and reporting positions.
