Biology 12th English

Biology 12th VVI Questions part – 02

Biology 12th VVI Questions part – 02 Q.1. What are restriction endonucleases ? Ans – Restriction endonucleases is an enzyme that cuts DNA at or near specific recognition known as restriction sites. These enzymes are found in bacteria and archaea and provide a defense mechanism against invading viruses. Restriction enzymes (or endonuclease) are classified into three types. …

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Biology 12th VVI Questions part – 01

Biology 12th VVI Questions part – 01 Q.1. Differentiate between nucleoside and nucleotide. Ans – Nucleoside:- (a) A nucleoside consists of a nitrogenous base covalently attached to a sugar but without the phosphate group. (b) Several nucleoside used as antiviral or anti cancer agents. Nucleotide:- (a) A nucleotide consists of nitrogenous base, a sugar and one to three phosphate …

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Reproduction Of Organisms VVI Questions part – 01

Reproduction Of Organisms VVI Questions part – 01 Q.1. Name any bacteria with flagellum. Ans – Examples of bacteria having flagella are vibrio cholerae, E.coli, spirochaetes etc. It helps in locomotion of bacteria. Q.2. Write a note in brief about asexual reproduction in organisms. Ans – Asexual reproduction is a mode of reproduction that involves a single parent. It …

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