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Biomolecules MCQs | Biomolecules Multiple Choice Questions(MCQs) & Answers

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Questions
1 Which biomolecule is distributed more widely in a cell?
A Chloroplast
B RNA
C DNA
D Spaherosomes

Answer: RNA
2 Name the simplest amino acid
A Alanine
B Tyrosine
C Asparagine
D Glycine

Answer: Glycine
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3 High content of triglycerides are found in
A VLDL
B LDL
C HDL
D Chylomicrons

Answer: Chylomicrons
4 In double helix of DNA, the two DNA strands are
A coiled around a common axis
B coiled around each other
C coiled differently
D coiled over protein sheath

Answer: Coiled around a common axis
5 A nucleotide is formed of
A purine, pyrimidine and phosphate
B purine, sugar and phosphate
C nitrogen base, sugar and phosphate
D pyrimidine, sugar and phosphate

Answer: Purine, sugar and phosphate
6 In RNA, thymine is replaced by
A adenine
B guanine
C cytosine
D uracil

Answer: Uracil
7 Lactose is composed of
A glucose + galactose
B fructose + galactose
C glucose + fructose
D glucose + glucose

Answer: glucose + galactose
8 Cellulose, the most important constituent of plant cell wall is made up of
A branched chain of glucose molecules linked by (3-1, 4 glycosidic bond in straight chain and a-1, 6 glycosidic bond at the site of branching
B unbranched chain of glucose molecules linked by (3-1, 4 glycosidic bond
C branched chain of glucose molecules linked by a-1, 6 glycosidic bond at the site of branching
D unbranched chain of glucose molecules linked by a-1, 4 glycosidic bond

Answer: Unbranched chain of glucose molecules linked by (3-1, 4 glycosidic bond
9 A nucleotide is formed of 95% water. Water present
A Purine, pyrimidine and phosphate
B Purine, sugar and phosphate
C Nitrogen base, sugar and phosphate
D Pyrimidine, sugar and phosphate

Answer: Nitrogen base, sugar and phosphate
10 Which is not consistent with double helical structure of DNA?
A A = T, C = G
B density of DNA decreases on heating
C A + T/C + G is not constant
D both a and b

Answer: A + T/C + G is not constant
11 RNA does not possess
A uracil
B thymine
C adenine
D cytosine

Answer: Thymine
12 Which of the following is a phospholipid?
A Sterol
B Cholesterol
C Lecithin
D Steroid

Answer: Lecithin
13 Haemoglobin has
A Primary structure
B Secondary structure
C Tertiary structure
D Quaternary structure

Answer: Quaternary structure
14 Ꞵ-oxidation occurs in
A Nucleus
B Cytoplasm
C Mitochondria
D Chloroplast

Answer: Mitochondria
15 Mineral associated with cytochrome is
A Mg
B Cu and Ag
C Fe
D Cu

Answer: Fe
16 Adenine is
A purine
B pyrimidine
C nucleoside
D nucleotide

Answer: Purine
17 Which is distributed more widely in a cell?
A DNA
B RNA
C chloroplasts
D sphaerosomes

Answer: RNA
18 Glycogen is a polymer of
A galactose
B glucose
C fructose
D sucrose

Answer: Glucose
19 The four elements that make up 99% of all elements found in a living system are
A C, H, O and P
B C, N, O and P
C H, O, C and N
D C, H, O and S

Answer: H, O, C and N
20 Which of the following nucleotide sequences contains 4 pyrimidine bases?
A GATCAATGC
B GCUAGACAA
C UAGCGGUAA
D both (b) and (c)

Answer: GATCAATGC
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