21.
Three cyclic structures of monosaccharides are given below. Which of these are anomers?
A
I and II
B
II and III
C
I and III
D
III is anomer of I and II
Answer :
I and II
22. Natural glucose is termed $$D$$ - glucose because :
A
$$ - OH$$ on the second carbon is on the right side in Fischer projection
B
$$ - OH$$ on the sixth carbon is on the right side in Fischer projection.
C
$$ - OH$$ on the fifth carbon is on the right side in Fischer projection.
D
It is dextrorotatory.
Answer :
$$ - OH$$ on the fifth carbon is on the right side in Fischer projection.
23. The conversion of maltose into glucose is possible by the enzyme
A
zymase
B
lactase
C
maltase
D
diastase
Answer :
maltase
24.
Which of the following aldohexoses give the same osazone derivative?
A
I and IV
B
I and III
C
II and III
D
III and IV
Answer :
I and III
25. Which of the following is not present in a nucleotide ?
A
Guanine
B
Cytosine
C
Adenine
D
Tyrosine
Answer :
Tyrosine
26. Which of the following is not a function of proteins?
A
Formation of hair, wool, skin and nails.
B
As a biological catalysts in the form of enzymes.
C
As food in the form of meat, eggs.
D
As energy provider for metabolism.
Answer :
As energy provider for metabolism.
27. Vitamin $$D$$ is also known as
A
sunshine vitamin
B
ascorbic acid
C
growth vitamin
D
reproductive vitamin
Answer :
sunshine vitamin
28. In fructose, the possible optical isomers are
A
12
B
8
C
16
D
4
Answer :
8
29. Biuret test is not given by
A
carbohydrates
B
polypeptides
C
urea
D
proteins
Answer :
carbohydrates
30. Which statement is incorrect about peptide bond ?
A
$$C–N$$ bond length in proteins is longer than usual $$C–N$$ bond length
B
Spectroscopic analysis shows planar structure of 
bond
bond C
$$C–N$$ bond length in proteins is smaller than usual $$C–N$$ bond length
D
None of these
Answer :
$$C–N$$ bond length in proteins is smaller than usual $$C–N$$ bond length
