221. Which amino acid is achiral ?
A
alanine
B
valine
C
proline
D
None of these
Answer :
None of these
222.
Match the column I with column II and mark the appropriate choice.
Column I
Column II
a.
Pentose sugar in $$DNA$$
1.
Ascorbic acid
b.
Nucleic acid
2.
Uracil
c.
$$RNA$$
3.
Genetic material
d.
Vitamin
4.
Furanose structure
A
a - 4, b - 3, c - 2, d - 1
B
a - 3, b - 2, c - 4, d - 1
C
a - 2, b - 3, c - 4, d - 1
D
a - 1, b - 2, c - 3, d - 4
Answer :
a - 4, b - 3, c - 2, d - 1
223.
The $$p{K_a}$$ values for the three ionizable groups $$X,$$ $$Y$$ and $$Z$$ of glutamic acid are 4.3, 9.7 and 2.2 respectively
The isoelectric point for the amino acid is :
A
7.00
B
3.25
C
4.95
D
5.95
Answer :
3.25
224. Which one of the following bases is not present in $$DNA$$ ?
A
Quinoline
B
Adenine
C
Cytosine
D
Thymine
Answer :
Quinoline
225.
Match the sugars in column I with their types given in column II and mark the appropriate choice.
Column I
Column II
a.
Glucose
1.
Ketohexose
b.
Fructose
2.
Aldohexose
c.
Ribose
3.
Aldotetrose
d.
Erythrose
4.
Aldopentose
A
a - 4, b - 1, c - 3, d - 2
B
a - 3, b - 4, c - 1, d - 2
C
a - 1, b - 2, c - 3, d - 4
D
a - 2, b - 1, c - 4, d - 3
Answer :
a - 2, b - 1, c - 4, d - 3
226. Which one of the following statements is not true regarding $$(+)$$ lactose?
A
$$(+)$$ lactose is a $$\beta - $$ glycoside formed by the union of a molecule of $$D{\text{ - }}\left( + \right){\text{ - }}$$ glucose and a molecule of $$D{\text{ - }}\left( + \right){\text{ - }}$$ galactose
B
$$(+)$$ lactose is a reducing sugar and does not exhibit mutarotation
C
$$(+)$$ lactose, $${C_{12}}{H_{22}}{O_{11}}$$ contains $$8O - H$$ groups
D
On hydrolysis $$(+)$$ lactose gives equal amount of $$D{\text{ - }}\left( + \right){\text{ - }}$$ glucose and $$D{\text{ - }}\left( + \right){\text{ - }}$$ galactose
Answer :
$$(+)$$ lactose is a reducing sugar and does not exhibit mutarotation
227. Hyperglycemia implies
A
high blood-sugar level
B
low blood-sugar level
C
high concentration of salt in blood
D
low concentration of salt in blood
Answer :
high blood-sugar level
228. Vitamin $$A$$ is present in
A
fish liver oil
B
milk
C
butter
D
all of these
Answer :
all of these
229. What is the basic formula for starch?
A
$${\left( {{C_6}{H_{12}}{O_6}} \right)_n}$$
B
$${\left( {{C_6}{H_{10}}{O_5}} \right)_n}$$
C
$${C_{12}}{H_{22}}{O_{11}}$$
D
$${\left( {{C_6}{H_{12}}{O_4}} \right)_n}$$
Answer :
$${\left( {{C_6}{H_{10}}{O_5}} \right)_n}$$
230. Mark the wrong statement about denaturation of proteins.
A
The primary structure of the protein does not change.
B
Globular proteins are converted into fibrous proteins.
C
Fibrous proteins are converted into globular proteins.
D
The biological activity of the protein is lost.
Answer :
Fibrous proteins are converted into globular proteins.