Q17 of 27 Page 1

(a)


b) A polypeptide consists of 14 different amino acids.


i) How many base pairs must be there in the processed mRNA that codes for this polypeptide?


ii) How many different types of tRNA are needed for the synthesis of this polypeptide?


(a)


(b) (i) One codon codes for one amino acid. Each codon has 3 base pairs. Since the polypeptide consists of 14 different amino acids, this indicates that there are 14 codons. Therefore, the total number of base pairs = 14 × 3 = 42 base pairs.


ii) One tRNA is required for charging one amino acid. Since there are 14 different amino acids, 14 different types of tRNA are needed for the synthesis of the given polypeptide.


More from this chapter

All 27 →
15

“Apomixes is a form of asexual reproduction that mimics sexual reproduction in plants”. Explain with the help of a suitable example.

 16


a) State the hypothesis which S.L. Miller tried to prove in the laboratory with the help of the set up given above.


b) Name the organic compound observed by him in the liquid water after running the above experiment.


c) A scientist simulated a similar set up and added CH4, NH3 and water vapour at 800℃. Which important component is missing in his experiment?


 18

How can inbreeding be both advantageous and disadvantageous in cattle breeding programme? (Mention any two advantages and two disadvantages)

 19

“Specific Bt Toxin gene is incorporated into cotton plant so as to control infestation of Bollworm”. Mention the organism from which the gene was isolated and explain its mode of action.