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Assertion (A) : Replication and transcri...

Assertion (A) `:` Replication and transcription occur in the nucleus but translation occurs in the cytoplasm.
Reason (R ) `:` m-RNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acids are available for protein synthesis.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Consider the following nucleic acids 1. DNA, 2. r-RNA, 3. t-RNA, 4. m-RNA choose the correct sequence of their arrangement according to their participation in protein synthesis

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In the protein synthesis, tRNA carrying the amino acid enters from which site of ribosome?

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After the addition of the last amino acid to a growing polypeptide chain during the process of protein synthesis, one of the termination codons reaches the appropriate site on the ribosomal surface and then the following envents take place (i) Release of t-RNA molecule from the ribosome. (ii) Dislodging of polypeptide chain from the t-RNA (iii) Dissociation of ribosomes into large and small subunits. ltBrgt The correct sequence of these events:

[A] : In mitosis , most of the ordered sequence of phases occur during I phase . [R] : Synthesis of mRNA , tRNA and ribosomal RNA occurs is G_(1) and replication of DNA of S phase .

[A]: Glycolysis occurs in the cytoplasm and converts some of the energy stored in glu-cose bonds to ATP and NADH. [R]: In glycolysis, glucose is rearranged and split into three carbon intermediates, each of which is rearranged further to eventually yield two molecules of pyruvic acid.

[A] : Keratin is one of a group of fibrous in- soluble proteins (scelero proteins) found in ectodermal cells of animals, as in hair, horns and nails. Leather is almost pure keratin. [R]: Cornification is a process occurring in vertebrate epidermis and epidermal struc- tures in which keratin replaces the cytoplasm of a cell.

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