Question

The lightly stained region of DNA called:

a. Heterochromatin

b. Euchromatin

c. Gene

d. Exon

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Genes are coded massages written into enormously long molecules called:

a. DNA b. RNA c. Polypeptide d. Polysaccharides

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Within DNA of human cell, only 75% represent codon. The function of the remainder are

unknown.

a. True

b. False

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Function protein of genes sequences code for protein:

a. Code

b. Codon

c. Exon

d. Intron

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The 3

end of strand signified by .......... on gene:

a) Promoter b) Initiation c) Start codon d) Termination codon

Answer 1

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1. The lightly stained region of DNA called (b) Euchromatin.

Euchromatin is the part of chromatin which is actively involved in the process of transcription. So, they are packed loosely and represent light coloured bands.

2. Genes are coded messages written into enormously long molecules called (b) RNA.

The process of transcription is involved for the synthesis of mRNA. The mRNA is then translated into the language of amino acids or proteins.

3. Within DNA of human cell, only 75% represent codon. The function of remainder are unknown.

(b) False

The rest part of DNA which do not code for any particular codon acts as stop codon. They stop the process of translation.

4. Functional part of genes sequence code for protein.

(c) Exon

Exon is the part of DNA which codes for protein.

In the process of splicing, introns are removed and exons are added.

5. The 3' end of strand signifies by (d) Termination codon on gene.

The process of transcription occurs in the direction of 5' to 3' end.