Q5 of 26 Page 1

Write one structural difference between the human functional insulin and pro-insulin.

The human functional insulin has ‘A’ and ‘B’ peptide chains only while the pro-insulin has an extra ‘C’ peptide chain.



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3

Mention the patterns of inheritance exhibited by human ABO blood group.

 4

Why is secondary immune response more intense than the primary response in humans? Give a reason.

 6

State any two characteristics of the tapetum, present in the microsporangium of an angiosperm. Why are non-viable pollen grains seen to develop in a microsporangium where tapetum is damaged or under developed? Give a reason.

 7

Write one difference each between

(a) Template strand and coding strand in a transcription unit of DNA.


(b) Exon and intron gene sequences.