Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following enzyme(s) are NOT essential for gene cloning? A. Restriction enzymes B. DNA ligase C. DNA mutase D. DNA recombinase E. DNA polymerase Choose the correct answer:
Restriction enzymes, DNA ligase and DNA polymerase are essential for gene cloning. DNA mutase (C) and DNA recombinase (D) are not required.
Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs. Choose the correct answer from the following:
In water the frog respires through skin and the buccal cavity; on land it additionally uses lungs. The statement is therefore true for both environments.
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
A boy–girl pair cannot be identical (monozygotic) twins, so they must be fraternal (dizygotic) twins, formed from two separate eggs and sperm.
Match List - I with List - II:
List - I — A. Progesterone, B. Relaxin, C. Melanocyte stimulating hormone, D. Catecholamines
List - II — I. Pars intermedia, II. Ovary, III. Adrenal Medulla, IV. Corpus luteum
Choose the correct answer:
Progesterone → corpus luteum (IV); Relaxin → ovary (II); MSH → pars intermedia (I); Catecholamines → adrenal medulla (III).
The blue and white selectable markers have been developed which differentiate recombinant colonies from non-recombinant colonies on the basis of their ability to produce colour in the presence of a chromogenic substrate. Given below are two statements about this method:
Statement I: The blue coloured colonies have DNA insert in the plasmid and they are identified as recombinant colonies.
Statement II: The colonies without blue colour have DNA insert in the plasmid and are identified as recombinant colonies.
In the light of the above statements, choose the most appropriate answer:
Insertion of DNA inactivates the lacZ gene, so recombinants cannot make the blue colour and form white colonies. Hence Statement II is correct and Statement I is incorrect.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.