CBSE Class 11 Biology Biomolecule Worksheet

Question. Which of the following carbohydrate is stored in liver
(a) Cellulose
(b) Glucose
(c) Glycogen
(d) Maltose

Answer: B

Question. The helical structure of protein is stabilized by:
(a) Peptide band
(b) Dipeptide band
(c) Hydrogen bands
(d) Vander Waal’s forces

Answer: C

Question. which of the following is a vitamin?
(a) Acetic acid
(b) Ascorbic acid
(c) Palmitic acid
(d) Saccharic acid

Answer: B

Question. Which of the following statements is true for protein synthesis
(a) Amino acids are directly recognized by m-RNA.
(b) The third base of codon is less specific.
(c) Only one codon codes for an amino acid.
(d) Every t-RNA has more than one amino acid attachment

Answer: B

Question. The number of chiral carbons in ß-D (+) glucose is:
(a) five
(b) six
(c) three
(d) four

Answer: A

Assertion Reason Based Question :

(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.

Question. Assertion: Glycosides are hydrolysed in acidic conditions
Reason: Glycosides are acetal.

Answer: A

Question. Assertion: Proteins are the polymer of α amino acids
Reason: Only α amino acid can form peptide bonds.

Answer: A

Question. Assertion: the two strands of DNA are complementary to each other.
Reason: they are linked by Disulphide bonds

Answer: C

Question. Assertion : Vitamins are essential part of dietary system of our body.
Reason : Our body can also synthesize almost all vitamins.

Answer: B

Question. Assertion : is not a carbohydrates.
Reason: It does not have free aldehyde group.

Answer: B

1  Amino acids, as the name suggests, have both an amino group and a carboxyl group in their structure. In addition, all naturally occurring amino acids (those which are found in proteins) are called L-amino acids. From this, can you guess from which compound can the simplest amino acid be made?

2 Many organic substances are negatively charged e.g., acetic acid, while others are positively charged e.g., ammonium ion. An amino acid under certain conditions would have both positive and negative charges simultaneously in the same molecule. Name such a form of amino acid.

3 Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against each of the following. a. Polysaccharide

b. Protein _________________ c. Between nitrogen base and sugar in a nucleotide __________________ d. between two nitrogen bases in a DNA______________

4 What is activation energy?

5 Starch, Cellulose, Glycogen, Chitin are polysaccharides found among the following. Choose the one appropriate and write against each. Cotton fibre ______________ Exoskeleton of cockroach _______________ Liver ________________ Peeled potato ______________

6  Schematically represent primary, secondary and tertiary structures of a hypothetical polymer say for example a protein.

7 How are prosthetic groups different from co-factors?

8 Formation of enzyme-substrate complex (ES) is the first step in catalysed reactions. Describe the other steps till the formation of product.

9 What are different classes of enzymes? Explain with the type of reaction they catalyse.

10 What is the difference between a nucleotide and nucleoside? Give examples of each.

11  Explain Watson and Crick model of DNA structure.

12 Explain competitive inhibition with the help of an example.

13 Give reasons:

a) Starch gives blue black colour with iodine solution.

b) Amino acid is called as substituted methane.