Q1
In RNA, thymine is replaced by
Correct Answer
Option D
Solution
(d) RNA contains uracil in place of thymine.
Biomolecules
Q2
Which of the following is the simplest amino acid?
Correct Answer
Option C
Solution
(c) In Glycine, R group is a hydrogen atom, making it the simplest amino acid.
Q3
Collagen is
Correct Answer
Option A
Solution
(a) Collagen is a major fibrous protein of connective tissue.
Q4
Which is an essential amino acid?
Correct Answer
Option D
Solution
(d) Essential amino acids include valine, leucine, isoleucine, lysine, methionine, phenylalanine, tryptophan and threonine.
Q5
Which one of the following is the most abundant protein in the animal world?
Correct Answer
Option C
Solution
(c) Collagen is the most abundant protein in the animal world.
Q6
The two polypeptides of human insulin are linked together by
Correct Answer
Option D
Solution
(d) The two polypeptide chains of insulin (A and B) are connected by disulfide bridges.
Q7
Ramachandran plot is used to confirm the structure of
Correct Answer
Option C
Solution
(c) Ramachandran plot is used to analyse the structure of proteins.
Q8
RNA does not possess
Correct Answer
Option B
Solution
(b) In RNA, pyrimidine thymine is replaced by uracil.
Q9
A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is
Correct Answer
Option D
Solution
(d) According to Chargaff's rule, A=T and G=C. 120 A + 120 T + 120 G + 120 C = 480 nucleotides.
Q10
The basic unit of nucleic acid is
Correct Answer
Option D
Solution
(d) Nucleic acid comprises polynucleotides.
Each nucleotide consists of nitrogenous bases, pentose sugar and phosphoric acid.
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