MCQ
A codon in mRNA has:
- A3 bases
- B2 bases
- C1 base
- DNumber of bases vary
Explanation:
The sequence of amino acids in proteins depends on the sequence of nucleotides in DNA.
The DNA produces mRNA molecules through the process of transcription. The mRNA is transported to the cytoplasm where it is translated into protein.
A sequence of three nucleotides in mRNA specifies a particular amino acid in a protein chain.
Hence, the genetic codon is a triplet.
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| Column - $I$ | Column - $II$ |
| $(a)$ Parasitism | $(i)$ $++$ |
| $(b)$ Commensalism | $(ii)$ $+-$ |
| $(c)$ Amensalism | $(iii)$ $0+$ |
| $(d)$ Mutualism | $(iv)$ $0-$ |
$I.$ Haemophilia is a sex-linked recessive disease
$II.$ Down's syndrome is due to aneuploidy
$III.$ Phenylketonuria is an autosomal dominant gene disorder
$IV.$ Phenylketonuria is an autosomal recessive gene disorder
$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder