Biomolecules Test

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Biomolecules Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following are purine bases?

(i) Guanine

(ii) Adenine

(iii) Thymine

(iv) Uracil

A
(i), (ii)

B
(ii), (iii)

C
(ii), (iv)

D
(i), (iii)
Question 2
1 / -0

Which of the following terms are correct about enzyme?

(i) Proteins

(ii) Dinucleotides

(iii) Nucleic acids

(iv) Biocatalysts

A
(ii), (iv)

B
(i), (iv)

C
(ii), (iii)

D
(iii), (ii)

Solution

Life is possible due to the coordination of various chemical reaction in living organisms. This occurs with the help of certain biocatalysts called enzymes. Almost all the enzymes are globular Protein.

Question 3

1 / -0

Match the following enzyms given in Column I with the reactions they catalyse given in Column II.

Column I (Enzymes)	Column II (Reactions)
(i) Invertase	(a) Decomposition of urea into \(NH_3\) and \(CO_2\)
(ii) Maltase	(b) Conversion of glucose into ethyl alcohol
(iii) Pepsin	(c) Hydrolysis of maltose into glucose
(iv) Urease	(d) Hydrolysis of cane sugar
(v) Zymase	(e) Hydrolysis of proteins into peptides

(i)- (d), (ii)- (c), (iii)- (e), (iv)- (a), (v)- (b)

(i)- (d), (ii)- (e), (iii)- (c), (iv)- (a), (v)- (b)

(i)- (a), (ii)- (c), (iii)- (e), (iv)- (d), (v)- (b)

(i)- (d), (ii)- (c), (iii)- (b), (iv)- (a), (v)- (e)

Question 4
1 / -0

Assertion : All naturally occurring α-amino acids except glycine are optically active.

Reason : Most naturally occurring amino acids have L-configuration.

A
Assertion and reason both are correct statements and reason explains the assertion.

B
Both assertion and reason are wrong statements.

C
Assertion is correct statement and reason is wrong statement.

D
Assertion and reason both are correct statements but reason does not explain assertion..

Solution

Except glycine, all other naturally occurring \(\alpha\)-amino acids are optically active, since the \(\alpha\)-carbon atom is asymmetric. These exist both in ‘D’ and ‘L’ forms. Most naturally occurring amino acids have L-configuration. L- Amino acids are represented by writing the —\(NH_2\) group on left hand side.
Question 5
1 / -0

Assertion : Deoxyribose, \(C_5H_{10}O_4\) is not a carbohydrate.

Reason : Carbohydrates are hydrates of carbon so compounds which follow \(C_x(H_2O)_y\) formula are carbohydrates.

A
Assertion and reason both are correct statements and reason explains the assertion.

B
Both assertion and reason are wrong statements.

C
Assertion is correct statement and reason is wrong statement.

D
Assertion is wrong statement and reason is correct statement.

Solution

Complete hydrolysis of DNA (or RNA) yields a pentose sugar, phosphoric acid and nitrogen containing hetero-cyclic compounds (called bases). In DNA molecules, the sugar moiety is β-D-2- deoxyribose.
Question 6
1 / -0

Assertion : Glycine must be taken through diet.

Reason : It is an essential amino acid.

A
Assertion and reason both are correct statements and reason explains the assertion.

B
Both assertion and reason are wrong statements.

C
Assertion is correct statement and reason is wrong statement.

D
Assertion is wrong statement and reason is correct statement.

Solution

The amino acids, which can be synthesised in the body, are known as non-essential amino acids. Glycine is an example of non-essential amino acid.
Question 7
1 / -0

Assertion : In presence of enzyme, substrate molecule can be attacked by the reagent effectively.

Reason : Active sites of enzymes hold the substrate molecule in a suitable position.

A
Assertion and reason both are correct statements and reason explains the assertion.

B
Both assertion and reason are wrong statements.

C
Assertion is correct statement and reason is wrong statement.

D
Assertion is wrong statement and reason is correct statement.

Solution

In presence of enzyme, substrate molecule can be attacked by the reagent effectively because active sites of enzymes hold the substrate molecule in a suitable position.
Question 8
1 / -0

Which of the following statements is incorrect?

A
Amylopectin is insoluble in water.

B
Fructose is reducing sugar.

C
Cellulose is the polymer of D-glucose.

D
D-Ribose sugar is present in DNA.

Solution

β-D-2-deoxyribose sugar is present in DNA.
Question 9
1 / -0

The pyrimidine bases present in DNA are

A
cytosine and adenine

B
cytosine and guanine

C
cytosine and thymine

D
cytosine and uracil.

Solution

DNA contains cytosine and thymine as pyrimidine bases and guanine and adenine as purine bases.

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Re-Attempt Weekly Quiz Competition

Biomolecules Test - 18

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Biomolecules Test - 18

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Question 1

(i), (ii)

(ii), (iii)

(ii), (iv)

(i), (iii)

Question 2

(ii), (iv)

(i), (iv)

(ii), (iii)

(iii), (ii)

Solution

Question 3

(i)- (d), (ii)- (c), (iii)- (e), (iv)- (a), (v)- (b)

(i)- (d), (ii)- (e), (iii)- (c), (iv)- (a), (v)- (b)

(i)- (a), (ii)- (c), (iii)- (e), (iv)- (d), (v)- (b)

(i)- (d), (ii)- (c), (iii)- (b), (iv)- (a), (v)- (e)

Question 4

Assertion and reason both are correct statements and reason explains the assertion.

Both assertion and reason are wrong statements.

Assertion is correct statement and reason is wrong statement.

Assertion and reason both are correct statements but reason does not explain assertion..

Solution

Question 5

Assertion and reason both are correct statements and reason explains the assertion.

Both assertion and reason are wrong statements.

Assertion is correct statement and reason is wrong statement.

Assertion is wrong statement and reason is correct statement.

Solution

Question 6

Assertion and reason both are correct statements and reason explains the assertion.

Both assertion and reason are wrong statements.

Assertion is correct statement and reason is wrong statement.

Assertion is wrong statement and reason is correct statement.

Solution

Question 7

Assertion and reason both are correct statements and reason explains the assertion.

Both assertion and reason are wrong statements.

Assertion is correct statement and reason is wrong statement.

Assertion is wrong statement and reason is correct statement.

Solution

Question 8

Amylopectin is insoluble in water.

Fructose is reducing sugar.

Cellulose is the polymer of D-glucose.

D-Ribose sugar is present in DNA.

Solution

Question 9

cytosine and adenine

cytosine and guanine

cytosine and thymine

cytosine and uracil.

Solution

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