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Biomolecules Class 11 MCQs Questions with Answers
Solving the Biomolecules Multiple Choice Questions of Class 11 Biology Chapter 9 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Biomolecules Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 9 Biology Class 11 and cross-check your answers during preparation.
I. Select the correct answer from the following questions:
Question 1.
Glucose is a
(a) Ketose hexose sugar
(b) Pyronose pentose sugar
(c) Aldose hexose sugar
(d) Furanose pentose sugar.
Answer
Answer: (c) Aldose hexose sugar.
Question 2.
Lactose molecule is composed of
(a) Fructose+Fructose
(b) Glucose+Fructose
(c) Glucose+Glucose
(d) Glucose+Galactose.
Answer
Answer: (d) Glucose+ Galactose.
Question 3.
Which group contains all polysaccharides?
(a) Glycogen, sucrose and maltose
(b) Maltose, lactose and sucrose
(c) Glycogen, glucose and sucrose
(d) Glycogen, cellulose and starch.
Answer
Answer: (d) Glycogen, cellulose and starch.
Question 4.
Amino acids are formed from
(a) Proteins
(b) Fatty acids
(c) Volatile acid
(d) α < -keto acids.
Answer
Answer: (d) α < -keto acids.
Question 5.
A nucleoside is formed of
(a) Phosphate and nitrogen base
(b) Pentose sugar and phosphate
(c) Pentose sugar, phosphate and nitrogen base
(d) Pentose sugar and nitrogen base.
Answer
Answer: (d) Pentose sugar and nitrogen base.
Question 6.
The most abundant component of a cell is
(a) Lipid
(b) Protein
(c) Water
(d) Cellulose
Answer
Answer: (c) Water.
Question 7.
Maximum amount of iron occures in
(a) Proteins
(b) Bone cells
(c) Leucocytes
(d) Erythrocytes.
Answer
Answer: (d) Erythrocytes.
Question 8.
Calcium is required for
(a) Blood clotting
(b) Bone formation
(c) Muscle contraction
(d) All of these.
Answer
Answer: (d) All of these
Question 9.
Immediate source of energy is
(a) ATP
(b) Glucose
(c) NADH
(d) Pyruvic acid.
Answer
Answer: (a) ATP.
Question 10.
An amino acid without an asymetrical carbon atoms
(a) Glycine
(b) Threonine.
(c) Proline
(d) Histidine.
Answer
Answer: (a) Glycine.
Question 11.
The most abundant protein is
(a) Glycine
(b) Valine
(c) Arginine
(d) Collagen
Answer
Answer: (d) Collagen.
Question 12.
Basic unit of nucleic acid is
(a) Pentose sugar
(b) Nucleotide
(c) Phosphoric acid
(d) Nitrogen base.
Answer
Answer: (b) Nucleotide.
Question 13.
The amino acids which are not synthesized in our body are called
(a) Deaminated
(b) Non-essential
(c) Essential
(d) Proteinaceous.
Answer
Answer: (c) Essential.
Question 14.
Which of the following is a non-reducing sugar?
(a) Lactose
(b) Glucose
(c) Maltose
(d) Sucrose.
Answer
Answer: (d) Sucrose.
Question 15.
The primary structure of a protein is due to
(a) ionic bonds
(b) hydrogen
(c) Peptide bonds
(d) S-S linkage
Answer
Answer: (c) Peptide bonds.
Question 16.
A source of maximum energy in a cell is
(a) proteins
(b) Vitamins
(c) Fats
(d) Carbohydrates.
Answer
Answer: (d) Carbohydrates.
Question 17.
Starch is a polymer of a basic unit of starch is
(a) Maltose
(b) Sucrose
(c) Glucose
(d) Fructose.
Answer
Answer: (c) Glucose.
Question 18.
Glycogen is a polymer of
(a) Galactose
(b) Glucose
(c) Sucrose
(d) Fructose.
Answer
Answer: (b) Glucose.
Question 19.
Cellulose occurs in
(a) Cell wall
(b) Cell membrane
(c) Cell interior
(d) Tunicates.
Answer
Answer: (a) Cell wall.
Question 20.
Protein/enzyme is formed by chemically bonding together of
(a) Lipases
(b) Carbohydrates
(c) Amino acids
(d) CO2
Answer
Answer: (c) Amino acids.
Question 21.
The most diverse molecules in a cell are
(a) Carbohydrates
(b) Proteins
(c) Lipids
(d) Mineral salts.
Answer
Answer: (b) Proteins.
Question 22.
Besides having, C,H,O which of the following also contains S and P?
(a) Fats
(b) Vitamins
(c) Carbohydrates
(d) Proteins.
Answer
Answer: (d) Proteins.
Question 23.
Natural silk fibre is
(a) Polyester
(b) Polysaccharide
(c) Polyamide
(d) Polyacid.
Answer
Answer: (c) Polyamide.
Question 24.
The enzymes having slightly different molecular structure but similar catalytic reaction are called
(a) Coenzyme
(b) Holoenzyme
(c) Proenzyme
(d) Isoenzyme.
Answer
Answer: (d) Isoenzyme.
Question 25.
Enzyme that functions at pH = 2.0 is
(a) Lipase
(b) Ptyalin
(c) Pepsin
(d) Trypsin.
Answer
Answer: (c) Pepsin.
Question 26.
Enzymes are polymers of
(a) Fatty acids
(b) Chromosomes
(c) Amino acids
(d) Nucleus and ribosomes.
Answer
Answer: (c) Amino acids.
II. Fill in the blanks:
Question 1.
All the elements present in a sample of ………….. are also present in a sample of living tissue.
Answer
Answer: earth’s crust
Question 2.
One is called the filtrate or more technically, the acid soluble, peol, and the second, the retentate or the acid insoluble ………..
Answer
Answer: fraction.
Question 3.
One ………… and ………… a compound.
Answer
Answer: isolates, purifies
Question 4.
Amino acids are ……………… containing an amino group and an acidic group as substituents on the some carbon i.e., the α < -carbon
Answer
Answer: organic compounds
Question 5.
The …………… and ………… properties of amino acids are essentially of the amino, carboxyl and the ‘R’ functional groups.
Answer
Answer: chemical, physical
Question 6.
………… are generally water insoluble.
Answer
Answer: Lipids
Question 7.
Some lipids have ……………. and a ………….. organic compound in them.
Answer
Answer: Phosphorous, Phosphorylated
Question 8.
When found attached to a sugar, they are called …………..
Answer
Answer: nucleosides.
Question 9.
………….. are not strictly macromolecules.
Answer
Answer: Lipids
Question 10.
Proteins are ……………
Answer
Answer: polypeptides
Question 11.
………….. are long chains of sugars.
Answer
Answer: Polysaccharides
Question 12.
…………, is a polymer of fructose.
Answer
Answer: Insulin
Question 13.
Allmost all ………….. are positive.
Answer
Answer: enzymes
Question 14.
The most important form of energy currency in living systems is the bond energy in a chemical called ……………. .
Answer
Answer: adenosine triphosphate(ATP)
Question 15.
The living state is a ……………. steady state to be able to perform work.
Answer
Answer: non-equilibrium
III. Mark the statement true (T) or false (F)
Question 1.
Biomacromolecules are polymers. They are made of building blocks which are different.
Answer
Answer: True.
Question 2.
Proteins are heteropolymers made of starch acids.
Answer
Answer: False
Question 3.
Nucleic acids (RNA and DNA) are composed of nucleotides.
Answer
Answer: True.
Question 4.
Enzyme, are composed of one or several polypeptide chains.
Answer
Answer: True.
Question 5.
When the binding of the chemical shuts off enzyme activity, the process is called inhibition and the chemical is called an inhibitor.
Answer
Answer: True.
Question 6.
When the inhibitor closely resembles the substrate in its mo-lecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.
Answer
Answer: True.
Question 7.
Almost all enzymes are proteins. There are some nucleic acids that behave like enzymes. These are called ribozymes.
Answer
Answer: True.
Question 8.
The latter constitute degradation and hence are called catabolic pathways.
Answer
Answer: True.
Question 9.
The most important form of energy currency in living systems is the bond energy in a chemical called adenosine triphosphate (ATP).
Answer
Answer: True.
Question 10.
Together all these chemical reactions are called metabolism.
Answer
Answer: True
Question 11.
The pitch would be 34Å. The rise perbase pair would be 3.4Å. This form of DNA with the above mentioned salient features is called B-DNA.
Answer
Answer: True
.
Question 12.
In a polysaccharide the individual mono saccharides are linked by a glycosidic bond. This bond is also formed by dehydration.
Answer
Answer: True
Question 13.
In addition, the long protein chain is also folded upon itself like a hollow wollen ball, giving rise to the secondary structure.
Answer
Answer: False
Question 14.
Other regions of the protein thread are folded into other forms in what is called the tertiary structure.
Answer
Answer: False
Question 15.
We can take any living tissue (a vegetable or a piece of liver etc.) and grind it in trichloroacetic acid (CI13 CCOOH) using a mortar and a pestle.
Answer
Answer: True
IV. Match the items of column I with the items of column II
| Column I | Column II |
| (a) Trichloroacetic acid | 1. Consist of nucleotides only. |
| (b) Inorganic compounds like | 2. Uridine and cytidine are nucleotides. |
| (c) Inorganic elements like | 3. Polypeptides. |
| (d) Nucleic acid like DNA and RNA | 4. CL13 CCOOH |
| (e) Adenosine, guanosine, thymidine | 5. Cellulose |
| (f) In addition, the long protein chain is also folded upon itself like a hollow | 6. Wollen ball, giving rise to the tertiary structure. |
| (g) Together all these chemical reactions are called | 7. is the bond energy in a chemical called adenosine triphosphate (ATP). |
| (h) Proteins are | 8. sulphate, phosphate. |
| (i) Plant cell walls are made of | 9. calcium, magnesium. |
| (j) Cotton fibre is | 10. Includes all enzmes catalysing inter-conversion of optical, geometric or positional isomers. |
| (k) The most important form of energy currency in living systems | 11. molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor. |
| (l) Adult human haemoglobin | 12. meta bolism |
| (m) The chemical which is | 13. Cellulose. |
| (n) Isomerares | 14. Consists of 4 subunits. |
| (o) When the inhibitor closely resembles the substrate in its | 15. converted into a product called a ‘substrate’ |
Answer
Answer:
| Column I | Column II |
| (a) Trichloroacetic acid | 4. CL13 CCOOH |
| (b) Inorganic compounds like | 8. sulphate, phosphate. |
| (c) Inorganic elements like | 9. calcium, magnesium. |
| (d) Nucleic acid like DNA and RNA | 1. Consist of nucleotides only. |
| (e) Adenosine, guanosine, thymidine | 2. Uridine and cytidine are nucleotides. |
| (f) In addition, the long protein chain is also folded upon itself like a hollow | 6. Wollen ball, giving rise to the tertiary structure. |
| (g) Together all these chemical reactions are called | 12. metabolism |
| (h) Proteins are | 3. Polypeptides. |
| (i) Plant cell walls are made of | 5. Cellulose |
| (j) Cotton fibre is | 13. Cellulose. |
| (k) The most important form of energy currency in living systems | 7. is the bond energy in a chemical called adenosine triphosphate (ATP). |
| (l) Adult human haemoglobin | 14. Consists of 4 subunits. |
| (m) The chemical which is | 15. converted into a product called a ‘substrate’ |
| (n) Isomerares | 10. Includes all enzmes catalysing inter-conversion of optical, geomet ric or positional isomers. |
| (o) When the inhibitor closely resembles the substrate in its | 11. molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor. |
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