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Biomolecules

NEET Chemistry · 137 questions · Page 2 of 14 · Click an option or "Show Solution" to reveal answer

Q11
Which is distributed more widely in a cell?
A DNA
B RNA
C Chloroplasts
D Sphaerosomes
Correct Answer
Option B
Solution

(b) Bulk of RNA occurs in the cytoplasm; it is distributed more widely than DNA.

Q12
Adenine is
A Purine
B Pyrimidine
C Nucleoside
D Nucleotide
Correct Answer
Option A
Solution

(a) Purines are 9-membered double ring structures, e.g. adenine and guanine.

Q13
In double helix of DNA, the two DNA strands are antiparallel and coiled around a common axis
A coiled around a common axis
B coiled around each other
C coiled differently
D coiled protein sheath
Correct Answer
Option A
Solution

(a) The two chains of DNA are spirally coiled around a common axis to form a regular, right handed double helix.

Q14
DNA is composed of repeating units of
A Ribonucleosides
B Deoxyribonucleosides
C Ribonucleotides
D Deoxyribonucleotides
Correct Answer
Option D
Solution

(d) DNA is a long double helix consisting of repeating units of deoxyribonucleotides.

Q15
Cellulose is made of
A unbranched chain of glucose molecules linked by beta-1,4 glycosidic bond
B branched chain of glucose molecules linked by alpha-1,4 glycosidic bond in straight chain and alpha-1,6 at branching
C unbranched chain of glucose molecules linked by alpha-1,4 glycosidic bond
D branched chain of glucose molecules linked by alpha-1,6 glycosidic bond at the site of branching
Correct Answer
Option A
Solution

(a) Cellulose is the structural polysaccharide of plant cell walls made of long chain polymers of beta-glucose units.

Q16
A polysaccharide which is synthesized and stored in liver cells is
A lactose
B galactose
C arabinose
D glycogen
Correct Answer
Option D
Solution

(d) Glycogen is a polysaccharide synthesized and stored in the liver.

Q17
In which one of the following groups are all the three examples of polysaccharides?
A Starch, glycogen, cellulose
B Sucrose, maltose, glucose
C glucose, fructose, lactose
D Galactose, starch, sucrose
Correct Answer
Option A
Solution

(a) Starch, glycogen, and cellulose are all polysaccharides.

Q18
Lactose is composed of
A Glucose + Glucose
B Glucose + Fructose
C Fructose + Galactose
D Glucose + Galactose
Correct Answer
Option D
Solution

(d) Lactose is a disaccharide of D-galactose and D-glucose bonded through a 1-4 glycosidic linkage.

Q19
Which of the following is a non-reducing carbohydrate?
A Maltose
B Sucrose
C Lactose
D Ribose 5-phosphate
Correct Answer
Option B
Solution

(b) Sucrose is classified as non-reducing sugar because it does not have any free aldehyde or keto group.

Q20
Two free ribonucleotide units are interlinked with
A peptide bond
B covalent bond
C hydrogen bond
D phosphodiester bond
Correct Answer
Option D
Solution

(d) Phosphodiester bond links the phosphate group of one nucleotide to the hydroxyl group of adjacent nucleotide.

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