Biology 9th Chap 2 : Topic 4 - Maryam Publications

Biology Chapter 2 : Topic 4

Structure and Functions of Lipids

1 / 15

Lipids are mainly composed of:

A) Fatty acids and glycerol

B) Amino acids only

C) Nucleotides

D) Glucose and fructose

2 / 15

Which property best distinguishes lipids from carbohydrates?

A) Lipids are insoluble in water.

B) Lipids contain carbon.

C) Lipids are found in cells.

D) Lipids contain hydrogen.

3 / 15

Which biomolecule serves as the body's major long-term energy reserve?

A) Protein

B) Lipid

C) RNA

D) DNA

4 / 15

A hibernating animal survives for months mainly by utilizing stored:

A) RNA

B) Vitamins

C) Lipids

D) DNA

5 / 15

Which cell structure contains a large amount of lipids?

A) Ribosome

B) Chromosome

C) Cell membrane

D) Nucleolus

6 / 15

Which function of lipids helps maintain body temperature in cold weather?

A) Protein synthesis

B) Enzyme formation

C) Insulation beneath the skin

D) Genetic storage

7 / 15

Which of the following is the richest source of lipids?

A) Fish muscle

B) Beans

C) Rice

D) Butter

8 / 15

A student consumes a diet rich in oils and butter. Which biomolecule is being consumed in the greatest amount?

A) Lipids

B) Nucleic acids

C) Carbohydrates

D) Proteins

9 / 15

Which pair is correctly matched?

A) Lipids — Immediate source of energy

B) Lipids — Protein synthesis

C) Lipids — Long-term energy storage

D) Lipids — Genetic information storage

10 / 15

Which statement about lipids is correct?

A) They are major components of cell membranes.

B) They are made of nucleotides.

C) They are polymers of amino acids.

D) They carry hereditary information.

11 / 15

Why do living organisms store excess energy as lipids instead of carbohydrates?

A) Lipids dissolve easily in water.

B) Lipids contain more stored energy per unit mass.

C) Lipids contain DNA.

D) Lipids are used for protein synthesis.

12 / 15

Which food is primarily a plant source of lipids?

A) Sunflower oil

B) Milk

C) Fish

D) Egg

13 / 15

A person lacking sufficient body fat may have difficulty with:

A) Producing RNA

B) Storing hereditary information

C) Forming chromosomes

D) Maintaining body insulation

14 / 15

Which of the following is NOT a function of lipids?

A) Insulation

B) Formation of cell membranes

C) Energy storage

D) Transmission of genetic information

15 / 15

The basic structural units of most lipids are:

A) Fatty acids and glycerol

B) Glucose and amino acids

C) Amino acids and nitrogen bases

D) Nucleotides and phosphates

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