Biotechnology
2025 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE BT 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 10–12 of 65. Imported answers require review unless explicitly marked reviewed.
Question 10
Open questionGAMCQ2 marksNeeds review
An object is said to have an
-fold rotational symmetry if the object, rotated by an angle of
, is identical to the original.Which one of the following objects exhibits 4-fold rotational symmetry about an axis perpendicular to the plane of the screen?
Note: The figures shown are representative.
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Koch’s postulate was established by Robert Koch while working on a disease caused by
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Corynebacterium diphtheriae causes diphtheria in humans, only when this bacterium is infected by
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