Biomolecules Test

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Biomolecules Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

Water insoluble component of starch is:

A
amylopectin

B
amylose

C
cellulose

D
none of these

Solution

Water insoluble component of starch is amylopectin. Water soluble component of starch is amylose.
Question 2
1 / -0

Which one of the following vitamins is water soluble?

A
Vitamin $$B$$

B
Vitamin $$E$$

C
Vitamin $$K$$

D
Vitamin $$A$$

Solution

Fat soluble vitamin - $$A$$, $$D$$, $$E$$, $$K$$
Water soluble vitamin - Vitamin $$B$$ complex and $$C$$
So, vitamin $$B$$ is water soluble.
Question 3
1 / -0

When a carbohydrate reacts with $$NaBH_4$$, the product is an:

A
Alditol

B
Aldaric acid

C
Aldonic acid

D
Aglycone

Solution

When a carbohydrate reacts with $$NaBH_4$$, the product is an alditol.
The $$C=O$$ groups in open chain forms of carbohydrates can be reduced to alcohols by sodium borohydride, $$NaBH_4$$, or catalytic hydrogenation ($$H_2$$, Ni, EtOH/$$H_2O$$). Aldehydes, i.e. aldoses, are reduced to primary alcohols. Ketones, i.e. ketoses, are reduced to secondary alcohols.
Question 4
1 / -0

In the Molisch reagent the substance used is:

A
$$\beta$$ naphthol in alchol

B
$$\alpha$$ naphthol in alchol

C
Reasrcinol in alchol

D
Rosaniline in water

Solution

Molisch's reagent: $$\alpha$$ -naphthol dissolved in ethanol. It is used in a chemical test for the presence of carbohydrates, based on the dehydration of the carbohydrate to aldehyde by action of acid.
Question 5
1 / -0

Constitutive enzymes are

A
Operational all the time

B
House keeping enzymes

C
Alloenzymes

D
Both A and B

Solution

Constitutive enzymes are enzymes which are always present in a constant amount. presence or absence of an inducer does not affect constitutive enzyme production. They are produced continuously as they are important for maintaining the routine metabolic functions of the cell hence they are called the housekeeping enzymes. Thus, the correct option is D.
Question 6
1 / -0

Firmly attached organic cofactor of holoenzyme is

A
Transferase

B
Activator

C
Modulator

D
Prosthetic group

Solution

Non-protein part of the holoenzyme which is tightly bound to an apoenzyme is called prosthetic group. For e.g., Heme is the iron-containing prosthetic group in cytochromes. Thus, the correct option is D.
Question 7
1 / -0

Alloenzymes are

A
Enzyme precursors

B
Similar enzymes formed from different genes

C
Different enzymes of an enzyme system

D
Antienzymes

Solution

Alloenzyme is opposite to the isoenzyme. It is coded by different alleles at the same locus. The two enzyme catalyzes the different type of reaction. Isoenzyme is also known as isozyme. When the two enzymes differ in amino acid sequence but catalyze the same chemical reaction they are known as isoenzyme.
So, the correct answer is option B.
Question 8
1 / -0

A glycoside is the carbohydrate form of an :

A
Ether

B
Acetal

C
Aglycone

D
Alcohol

Solution

A glycoside is the carbohydrate form of an acetal. In disaccharide, two monosaccharide units are attached to each other through oxygen which acts as glycosidic linkage. An acetal is obtained when two molecules of alcohol and a carbonyl compound condense.
Question 9
1 / -0

Sulfur containing amino acid is :

A
Alanine

B
Proline

C
Tyrosine

D
Cysteine

Solution

Cysteine is the amino acid which have sulphur in its structure.
Question 10
1 / -0

Which one of the following is correct about $$H$$-bonding in nucleotide?

A
$$A-T$$, $$G-C$$

B
$$A-G$$, $$T-C$$

C
$$G-T$$, $$A-C$$

D
$$A-A$$, $$T-T$$

Solution

The structure of DNA molecule is a double helix structure. In this structure double helix are made up of polynucleotide chains which are held together by $$H$$-bonds. In these helixes the adenine $$\left( A \right) $$ base is linked with thymine $$\left( T \right)$$ by two $$H$$-bonds and guanine $$\left( G \right) $$ is linked with cytocine $$\left( C \right)$$ by three $$H$$-bonds as $$A\equiv T$$, and $$G\equiv C$$.

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Biomolecules Test - 53

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Biomolecules Test - 53

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SHARING IS CARING

Question 1

amylopectin

amylose

cellulose

none of these

Solution

Question 2

Vitamin $$B$$

Vitamin $$E$$

Vitamin $$K$$

Vitamin $$A$$

Solution

Question 3

Alditol

Aldaric acid

Aldonic acid

Aglycone

Solution

Question 4

$$\beta$$ naphthol in alchol

$$\alpha$$ naphthol in alchol

Reasrcinol in alchol

Rosaniline in water

Solution

Question 5

Operational all the time

House keeping enzymes

Alloenzymes

Both A and B

Solution

Question 6

Transferase

Activator

Modulator

Prosthetic group

Solution

Question 7

Enzyme precursors

Similar enzymes formed from different genes

Different enzymes of an enzyme system

Antienzymes

Solution

Question 8

Ether

Acetal

Aglycone

Alcohol

Solution

Question 9

Alanine

Proline

Tyrosine

Cysteine

Solution

Question 10

$$A-T$$, $$G-C$$

$$A-G$$, $$T-C$$

$$G-T$$, $$A-C$$

$$A-A$$, $$T-T$$

Solution

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