Biology MCQs

11. Who among the following first synthesized “gene” in a laboratory ?
[A] Arthur kornberg
[B] Hargobind Khorana
[C] Gregor Mendel
[D] Watson and crick

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12. Pest-resistant cotton commonly known as ‘Bt-Cotton’ is genetically engineered by inserting a gene from a:
[A] Bacterium
[B] Virus
[C] Microalgae
[D] Protist

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13. Which of the following cells are closely associated and interacting with guard cells?
[A] Transfusion tissue
[B] Complementary cells
[C] Subsidiary cells
[D] Hypodermal cells

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14. In typhoid which of the following drugs is administered? (UPSC Prelims 1983)
[A] Chloromycetin
[B] Penicillin
[C] Sulphonamide
[D] Tetracycline

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15. Why man cannot digest cellulose whereas cows can do so? (UPSC Prelims 1992)
[A] Their gut contains certain bacteria capable of digesting cellulose
[B] They have a many-chambered stomach
[C] They have efficient grinding molars
[D] They produce enzyme cellulose which can digest cellulose

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16. At which of the following ages Rennin and lactase, disappear in the human body? (UPSC Prelims 1994)
[A] two
[B] three
[C] five
[D] eight

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17. What is the average fat content of buffalo milk? (UPSC Prelims 1997)
[A] 7.2%
[B] 4.5%
[C] 9.0%
[D] 10.0%

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18. Which one of the following statements is correct? (UPSC Prelims 2002)
[A] Prions are the smallest free-living cells
[B] The cell wall of Mycoplasmas is made up of amino sugars
[C] Viroids consist of a single-stranded RNA molecule
[D] Rickettsias lack cell wall

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19. What term is used for a gene that exhibits multiple effects?
[A] Pleiotropism
[B] Multitropism
[C] Complementary
[D] Allele

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20. Which blood group is referred to as universal recipient?
[A] AB +ve
[B] AB -ve
[C] O +ve
[D] O -ve

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