Biomolecules MCQs | Biomolecules Objective Type Questions & Answers

21 Which purine base is found in RNA?
A thymine
B uracil
C cytosine
D guanine

Answer: Guanine
22 In which of the following groups are all polysaccharides?
A sucrose, glucose and fructose
B maltose, lactose and fructose
C glycogen, sucrose and maltose
D glycogen, cellulose and starch

Answer: Glycogen, cellulose and starch
23 The term enzyme was coined by
A Urey Miller
B Pasteur
C Kuhne
D Buchner

Answer: Kuhne
24 Most abundant RNA in the cell
D t-RNA threonine

Answer: r-RNA
25 Koshland’s theory of enzyme action is known as
A Lock and key theory
B Reduced fit theory
C Induced fit theory
D Enzyme coenzyme theory

Answer: Induced fit theory
26 In which of the following an anticodon occurs

Answer: t-RNA
27 Mineral associated with cytochrome is
A Cu
B Mg
C Cu and Mg
D Fe

Answer: Fe
28 The basic unit of nucleic acid is
A pentose sugar
B nucleoid
C nucleoside
D nucleotide

Answer: nucleotide
29 A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is
A 120
C 240
D 480

Answer: 480
30 Living cell contains 60 – in human body is
A 60 – 65%
B 50 – 55%
C 75 – 80%
D 65 – 70%

Answer: 65 – 70%
31 Amino acids are mostly synthesised from
A mineral salts
B fatty acids
C volatile acids
D A-ketoglutaric acid

Answer: A-ketoglutaric acid
32 Which is wrong about nucleic acids?
A DNA is single stranded in some viruses
B RNA is double stranded occasionally
C length of one helix is 45 A in B-DNA
D one turn of Z-DNA has 12 bases

Answer: length of one helix is 45 A in B-DNA
33 What are the most diverse molecules in the cell?
A lipids
B mineral salts
C proteins
D carbohydrates

Answer: Proteins
34 In RNA, thymine is replaced by
A adenine
B guanine
C cytosine
D uracil

Answer: uracil
35 Amino acids are produced from
A proteins
B fatty acids
C essential oils
D a-keto acids

Answer: proteins
36 DNA is composed of repeating units of
A ribonucleosides
B deoxyribonucleosides
C ribonucleotides
D deoxyribonucleotides

Answer: deoxyribonucleotides
37 The fastest enzyme is
A DNA gyrase
B Pepsin
C DNA polymerase
D Carbonic unhydrase

Answer: Carbonic unhydrase
38 Which is the most abundant biomolecule on earth?
A Mineral salts
B Proteins
C Lipids
D Carbohydrates

Answer: Carbohydrates
39 The most common secondary structure of proteins is
A Ꞵ-pleated sheet
B Ꞵ-pleated sheet parallel
C Ꞵ-pleated sheet non-parallel
D Ɑ-helix

Answer: Ɑ-helix
40 Which is a reducing sugar?
A Galactose
B Gluconic acid
C Sucrose
D Ꞵ-methyl galactosidase

Answer: Galactose