252. Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at $$pH$$ 1.0, which of the following species will predominate ?
A
B
C
D
Answer :
253. Nucleic acids are
A
small molecules
B
dipeptides
C
long chain polymers of nucleotides
D
polypeptides
Answer :
long chain polymers of nucleotides
254. Iso-electric point of alanine is $$(pH = 6).$$ At which $$pH,$$ maximum concentration of zwitter ion of alanine will be present ?
A
$$pH > 6$$
B
$$pH < 6$$
C
$$pH = 6$$
D
$$pH = 7$$
Answer :
$$pH = 6$$
255.
Glucose \[\xrightarrow{HCN}X\xrightarrow{\text{Hydrolysis}}Y\xrightarrow[\text{Heat}]{HI}Z\]
Identify $$Z.$$
A
2-Iodoheptane
B
Heptane-2-ol
C
2-Iodohexane
D
Heptanoic acid
Answer :
Heptanoic acid
256. Which one of the following has magnesium?
A
Vitamin - $${B_{12}}$$
B
Chlorophyll
C
Haemocyanin
D
Carbonic anhydrase
Answer :
Chlorophyll
257. Glycogen is a branched chain polymer of $$\alpha {\text{ - }}D{\text{ - }}$$ glucose units in which chain is formed by $$C{\text{ - 1}} - C{\text{ - }}4$$ glycosidic linkage whereas branching occurs by the formation of $$C{\text{ - 1}} - C{\text{ - 6}}$$ glycosidic linkage. Structure of glycogen is similar to __________.
A
amylose
B
amylopectin
C
cellulose
D
glucose
Answer :
amylopectin
258. The general formula of carbohydrates is
A
$${C_n}{H_{2n + 1}}O$$
B
$${C_n}{H_{2n}}O$$
C
$${C_n}{\left( {{H_2}O} \right)_n}$$
D
$${C_n}{\left( {{H_2}O} \right)_{2n}}$$
Answer :
$${C_n}{\left( {{H_2}O} \right)_n}$$
259.
Which statement is incorrect about peptide bond 
A
$$C-N$$ bond length in proteins is longer than usual bond length of $$C-N$$ bond
B
Spectroscopic analysis show planar structure of 
group
group C
$$C-N$$ bond length in proteins is smaller than usual bond length of $$C-N$$ bond
D
None of the above
Answer :
$$C-N$$ bond length in proteins is smaller than usual bond length of $$C-N$$ bond
260. Which of the following is a non-reducing sugar ?
A
Lactose
B
Fructose
C
Sucrose
D
Maltose
Answer :
Sucrose