2004
Q51
NEET
MCQ
10 Mar 2026
The helical structure of protein is stablised by
A.
dipeptide bonds
B.
hydrogen bonds
C.
ether bonds
D.
peptide bonds
2004
Q52
NEET
MCQ
10 Mar 2026
A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
A.
Three
B.
Four
C.
One
D.
Two
2004
Q53
NEET
MCQ
10 Mar 2026
Number of chiral carbons in $\beta $-$D$-(+) glucose is
A.
five
B.
six
C.
three
D.
four
2004
Q54
NEET
MCQ
10 Mar 2026
The correct statement in respect of protein haemoglobin is that it
A.
functions as a catalyst for biological reactions
B.
maintains blood sugar level
C.
acts as an oxygen carrier in the blood
D.
forms antibodies and offers resistance to diseases.
2003
Q55
NEET
MCQ
10 Mar 2026
Vitamin B12 contains
A.
Fe (II)
B.
Co (III)
C.
Zn (II)
D.
Ca (II)
2003
Q56
NEET
MCQ
10 Mar 2026
Phospholipids are esters of glycerol with
A.
three carboxylic acid residues
B.
two carboxylic acid residues and one phosphate group
C.
one carboxylic acid residue and two phosphate groups
D.
three phosphate groups.
2003
Q57
NEET
MCQ
10 Mar 2026
Chargaff's rule states that in an organism
A.
amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
B.
amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
C.
amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
D.
amounts of all bases are equal.
2003
Q58
NEET
MCQ
10 Mar 2026
Glycolysis is
A.
oxidation of glucose to glutamate
B.
conversion of pyruvate to citrate
C.
oxidation of glucose to pyruvate
D.
conversion of glucose to haem.
2002
Q59
NEET
MCQ
10 Mar 2026
Enzymes are made up of
A.
edible proteins
B.
proteins with specific structure
C.
nitrogen containing carbohydrates
D.
carbohydrates.
2002
Q60
NEET
MCQ
10 Mar 2026
Which is not true statement?
A.
$\alpha $-carbon of $\alpha $-amino acid is asymmetric.
B.
All proteins are found in $L$-form
C.
Human body can synthesise all proteins they need.
D.
At pH = 7 both amino and carboxylic groups exist in ionised form.
2001
Q61
NEET
MCQ
10 Mar 2026
Which of the following is correct about H-bonding in nucleotide?
A.
A $-$ T, G $-$ C
B.
A $-$ G, T $-$ C
C.
G $-$ T, A $-$ C
D.
A $-$ A, T $-$ T
2001
Q62
NEET
MCQ
10 Mar 2026
Which is the correct statement?
A.
Starch is a polymer of $\alpha $-glucose.
B.
Amylose is a component of cellulose.
C.
Proteins are composed of only one type of amino acid.
D.
In cyclic structure of fructose, there are four carbons and one oxygen atom.
2001
Q63
NEET
MCQ
10 Mar 2026
Which statement is incorrect about peptide bond?
A.
C $-$ N bond length in proteins is longer than usual bond length of N $-$ C bond.
B.
Spectroscopic analysis shows planar structure of
group.
C.
C $-$ N bond length in proteins is smaller than usual bond length of C $-$ N bond.
D.
None of the above.
2001
Q64
NEET
MCQ
10 Mar 2026
Which of the following is correct?
A.
Cycloheptane is an aromatic compound.
B.
Diastase is an enzyme
C.
Acetophenone is an ether.
D.
All of these.
2000
Q65
NEET
MCQ
10 Mar 2026
Which one is responsible for production of energy in bio-reaction?
A.
Thyroxine
B.
Adrenaline
C.
Oestrogen
D.
Progesterone
2000
Q66
NEET
MCQ
10 Mar 2026
Mg is present in
A.
chlorophyll
B.
haemoglobin
C.
vitamin-D
D.
vitamin-B
2000
Q67
NEET
MCQ
10 Mar 2026
$\alpha $ -$D$-glucose and $\beta $-$D$-glucose are
A.
epimers
B.
anomers
C.
enantiomers
D.
diastereomers
