Biomolecules Test

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Biomolecules Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

Which type of Linkage is present in amylopectin?

A
$$\alpha-D-Glucose, C_1-C_4$$ & $$C_2-C_6$$

B
$$\alpha-D-Glucose, C_1-C_4$$ & $$C_1-C_6$$

C
$$\beta-D-Glucose, C_1-C_4$$ & $$C_2-C_6$$

D
$$\beta-D-Glucose, C_1-C_4$$ & $$C_1-C_6$$

Solution

Amylopectin is a component of the starch.
80% of starch is made up of amylopectin. It is highly branched type of the starch and it consists of $$\alpha$$-glucose with linear linkage between $$C_1$$ and $$C_4$$.
Also there is braching present between $$C_1$$ and $$C_6$$.
Question 2
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The glycosidic linkage involved in linking the glucose units in amylose part of starch is:

A
$$C_{1} - C_{4}\beta - linkage$$

B
$$C_{1} - C_{6}\alpha - linkage$$

C
$$C_{1} - C_{6}\beta - linkage$$

D
$$C_{1} - C_{4}\alpha - linkage$$

Solution

$$C_{1} - C_{4} \alpha - linkage$$.

Amylases starch is a polymer of glucose molecule linked with glycosidic linkage. It comes in two forms, i.e amylose and amylopectin. Here amylose shows a linear structure of glucose units linked together by glycosidic bonds to form a helical structure.

Amylose is a polysaccharide made of $$\alpha-D-glucose$$ units, bonded to each other through $$\alpha(1→4)$$ glycosidic bonds.

It is one of the two components of starch, making up approximately 20-30%.

Option D is correct.
Question 3
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Which of the following is not an appropriate source of starch?

A
Rice

B
Corn

C
Potato

D
Molasses

Solution
Question 4
1 / -0

Which is odd?

A
Chitin - Carbohydrate

B
Pectin -Protein

C
Steroid - Lipid

D
Wax - Lipid

Solution
Question 5
1 / -0

Which of the following is carbohydrate?

A
Triamine

B
Lactose

C
Glycerol

D
Insulin

Solution
Question 6
1 / -0

Protein enzyme are

A
Carbohydrates

B
amino acids

C
both (a) and (b)

D
none of these

Solution

A large protein enzyme molecule is $$\text{composed of one or more amino acid chains called polypeptide chains.}$$ The amino acid sequence determines the characteristic folding patterns of the protein's structure, which is essential to enzyme specificity.

Option B is correct.
Question 7
1 / -0

Ribose and deoxyribose differ in structure around a single carbon, namely:

A
$$C-1$$

B
$$C-2$$

C
$$C-3$$

D
$$C-4$$

Solution

The pentose sugar in DNA is called deoxyribose, and in RNA, the sugar is ribose. $$\text{The difference between the}$$ $$\text{sugars is the presence of the hydroxyl group on the 2' carbon of the ribose and its absence on the 2' carbon of}$$ $$\text{the deoxyribose.}$$

Option B is correct.
Question 8
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Prosthetic group of glycoprotein is:

A
lipids

B
carbohydrate

C
metal ions

D
nucleic acid
Solution
$$\text{Glycoproteins belong to the category of conjugated proteins. Conjugated proteins are composed of a protein}$$ $$\text{molecule joined to a non-protein group called the prosthetic group. The prosthetic group in a glycoprotein}$$ $$\text{is carbohydrate.}$$ The glycoproteins occur in blood plasma, egg albumin, saliva, mucus, and blood group substances.
Lipids are prosthetic groups in lipoproteins. The lipoproteins occur in membranes, milk casein, blood serum and egg yolk vitellin.
Nucleic acids are prosthetic groups in nucleoproteins. The examples of nucleoproteins are deoxyribonucleoprotein of chromosomes and ribonucleoproteins of ribosomes.
Metal ions are prosthetic groups in metalloproteins. The enzyme carbonic anhydrase is an example. It contains zinc ions besides amino acids in the molecule.
Thus, the correct answer is option B.
Question 9
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Which one of-the following polysaccharides is composed of $$\beta-$$ glycosidic link?

A
Starch

B
Glycogen

C
Dextrin

D
Cellulose
Solution
Starch is a homopolysaccharide of D-glucose and contains two types of glucose polymer, amylase, and amylopectin. The long, unbranched chains of D-glucose residues connected by $$\text{alpha 1,4 linkages}$$ are termed as amylase. The branched polymer of glucose wherein $$\text{alpha 1,4 glycosidic linkages}$$ join successive glucose with branch points having $$\text{alpha 1,6 linkages.}$$
Glycogen is also homopolysaccharide of D-glucose that differs from starch in being highly branched (every 8-12 residues as compared to the presence of branches in starch for every 24-30 residues) but carries same bonding pattern. This makes options A and B incorrect.
Dextrins are a group of low-molecular-weight carbohydrates produced by the hydrolysis of starch or glycogen. Dextrins are mixtures of polymers of D-glucose units linked by $$α-(1→4) \ or\ α-(1→6)$$ glycosidic bonds.
$$\text{Cellulose is a linear homopolysaccharide of D-glucose units, which are linked together by beta-1,4 glycosidic bonds.}$$ This makes option D the correct answer.
Question 10
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One per cent composition of an organic compound $$A$$ is carbon $$= 85.71\%$$ and $$hydrogen = 14.29\%$$. Its vapour density is $$14$$. Consider the following reaction sequence:
$$A \xrightarrow {Cl_{2}/H_{2}O}$$ $$B \xrightarrow {(ii)H_{3}O^{+}}{{\xrightarrow {(i)KCN/ EtOH}}}$$ C;
Identify C.

A
$$CH_{3} - \underset {\underset {OH}{|}}{C}H - CO_{2}H$$

B
$$HO - CH_{2} - CH_{2} - CO_{2}H$$

C
$$HO - CH_{2} - CO_{2}H$$

D
$$CH_{3}CH_{2} - CO_{2}H$$

Solution

product C is
$$HO - CH_{2} - CH_{2} - CO_{2}H$$