Daily Practice Problems Biomolecules

Question 1:

Choose the correct options:

1. Which among the following forms the acid-insoluble fraction during the chemical analysis?

(a) Nucleic acids

(b) Proteins

(d) All of the above

2. Adenosine is a

(a) Nucleic acid

(b) Nucleoside

(d) Nitrogenous base

3. Alkaloids, essential oils, flavonoids, rubber, scents, gums and spices represent:

(a) Primary metabolites

(b) Secondary metabolites

(d) Non-essential amino acids

4. The information about the sequence of amino acids in a protein is determined by its:

(a) Primary structure

(b) Secondary structure

(d) Quaternary structure

Question 2:

Name the following:

1. The most abundant protein in the animal world.

2. The most abundant protein in the biosphere.

3. A polysaccharide which acts as a storehouse of energy in plant cells.

4. The bond that links together two monosaccharides.

5. The energy currency in the living systems.

Question 3:

Fill in the blanks with appropriate words:

1. Inulin is a polymer of __________.

2. The backbone of a DNA strand is made up of __________ chain.

3. ___________ are a source of essential amino acids.

4. In ________ pathways, complex substances are synthesised from simpler substances.

5. __________ are some nucleic acids that act as enzymes.

Question 4:

Complete the given analogies by observing the relation between the first two words and then filling an appropriate word at the fourth place:

1. Polysaccharides : Monosaccharides :: Proteins : __________

2. Adenine : Nitrogenous base :: Adenylic acid : __________

3. Building up : Anabolism :: Breaking down : __________

4. Protein moeity : Apoenzyme :: Non-protein moeity : __________

5. Purine : Guanine :: Pyramidine : ___________

Question 5:

State the type of linkage seen between the following:

1. Two amino acids

2. Two monosaccharides

3. Two nucleotides

4. A deoxyribose sugar and a nitrogenous base

5. A purine and a pyrimidine

Question 6:

Define the following terms:

1. Essential amino acids

2. Zwitter ion

3. Nucleoside

4. Apoenzyme

5. Prosthetic groups

Question 7:

State whether the following statements are true or false.

1. Lecithin is an example of phospholipids.

2. Molecular weight of lipids is less than 800 Da but they appear in the acid insoluble fraction.

3. Proteins are homopolymers.

4. Chitin, a complex polysaccharide, forms the exoskeleton in arthropods.

5. The enzymatic activity increases with temperature and pH.

Question 8:

Classify the following as nitrogenous base, nucleoside or nucleotide:

1. Cytosine

2. Cytidine

3. Adenylic acid

4. Guanosine

5. Thymidine

Question 9:

Name one example of each of the following:

1. A proteinaceous enzyme

2. An alkaloid

3. A secondary metabolite used as drugs

4. A proteinaceous hormone

5. A coenzyme

Question 10:

Match the columns A and B.

Column A	Column B
1. Starch	a. Secondary metabolites
2. Essential oils	b. Watson and Crick
3. Haemoglobin	c. Iodine test
4. Double helical model	d. Competitive inhibitor
5. Malonate	e. Quaternary structure

Question 11:

Attempt drawing the structures of the following amino acids:

1. Glycine

2. Alanine

3. Serine

Question 12:

Why are lipids not strictly considered macromolecules?

Question 13:

How are essential amino acids different from non-essential amino acids?

Question 14:

What is the molecular basis for the detection of starch by Iodine test?

Question 15:

Briefly explain the quaternary structure of proteins with an example.

Question 16:

Give the salient features of the double helical model of DNA molecule.

Question 17:

Why is living state considered to be a non-equilibrium steady state?

Question 18:

State the effect of the following factors on the enzymatic activity:

1. Temperature

2. pH

3. Concentration of substrate

Question 19:

Name the various classes into which enzymes are classified.

Question 20:

How are prosthetic groups different from coenzymes?

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Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 11 Biology Biomolecules NCERT Chapter 9 useful.

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