171. The two functional groups present in a typical carbohydrate are :
A
$$ - CHO$$ and $$ - COOH$$
B
$$ > C = O$$ and $$ - OH$$
C
$$ - OH$$ and $$ - CHO$$
D
$$ - OH$$ and $$ - COOH$$
Answer :
$$ - OH$$ and $$ - CHO$$
172.
The following carbohydrate is
A
a ketohexose
B
an aldohexose
C
an $$\alpha $$ - furanose
D
an $$\alpha $$ - pyranose
Answer :
an aldohexose
173. A diabetic person carries a packet of glucose with him always, because
A
glucose increases the blood sugar level slowly
B
glucose reduces the blood sugar level
C
glucose increases the blood sugar level almost instantaneously
D
glucose reduces the blood sugar level slowly
Answer :
glucose increases the blood sugar level almost instantaneously
174. 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
Answer :
All proteins are found in $$L$$ - form
175. Which type of interactions are responsible for making the $$\alpha $$ - helix structure stable?
A
Peptide bonds between $$ - N{H_2}$$ and $$ - CO$$ groups of adjacent carbon chains.
B
Hydrogen bonds between $$- NH$$ of amino acid in one turn with $$-CO$$ of amino acid to adjacent turn.
C
$$-OH$$ group of one amino acid with $$-CO$$
group of other amino acid on the turn.
D
Hydrogen bonds between adjacent amino acids.
Answer :
Hydrogen bonds between $$- NH$$ of amino acid in one turn with $$-CO$$ of amino acid to adjacent turn.
176. Haemoglobin is
A
an enzyme
B
a globular protein
C
a vitamin
D
a carbohydrate
Answer :
a globular protein
177. The couplings between base units of $$DNA$$ is through
A
hydrogen bonding
B
electrostatic bonding
C
covalent bonding
D
van der Waals’ forces
Answer :
hydrogen bonding
178. Diazo coupling is useful to prepare some
A
pesticides
B
dyes
C
proteins
D
vitamins
Answer :
dyes
179. The hormone which controls the processes like burning of fats, proteins and carbohydrates to liberate energy in the body is
A
cortisone
B
thyroxine
C
adrenaline
D
insulin
Answer :
thyroxine
180. The hormone thyroxine
A
is secreted by pancreas
B
is secreted by thyroid
C
decreases blood sugar
D
does not stimulate metabolism
Answer :
is secreted by thyroid