Biomolecules Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about amino acids is correct?

Amino acids are the monomers of nucleic acids.
All amino acids contain an amino group and a carboxyl group.
Amino acids do not contain nitrogen.
Amino acids are linked by glycosidic bonds.
2

Amino acids contain an amino (-NH₂) group and a carboxyl (-COOH) group. They are linked by peptide bonds, not glycosidic bonds.

Which of the following statements about lipids is incorrect?

Lipids are hydrophobic molecules.
Lipids play a role in energy storage.
Lipids contain peptide bonds like proteins.
Lipids form structural components of cell membranes.
3

Lipids do not contain peptide bonds; these are found in proteins.

What is the primary function of ribonucleic acid (RNA)?

Genetic information storage
Catalysis of biochemical reactions
Transporting genetic information for protein synthesis
Providing structural support to the cell
3

RNA primarily functions in protein synthesis by carrying genetic instructions from DNA.

Which of the following statements is correct about proteins?

Proteins are composed of nucleotides.
Proteins are formed by peptide bonds between amino acids.
Proteins store genetic information.
Proteins do not play a role in enzyme activity.
2

Proteins are formed by peptide bonds between amino acids. They do not store genetic information; that function belongs to nucleic acids.

Which enzyme is used in glycolysis to convert glucose into glucose-6-phosphate?

Amylase
Hexokinase
Pepsin
Lipase
2

Hexokinase phosphorylates glucose to glucose-6-phosphate in glycolysis.

Which of the following statements about carbohydrates is incorrect?

Starch and glycogen serve as energy storage molecules.
Cellulose provides structural support in plant cells.
Carbohydrates are composed of amino acids.
Monosaccharides are the simplest form of carbohydrates.
3

Carbohydrates are composed of sugar units, not amino acids.

Which of the following statements is incorrect about enzymes?

Enzymes increase the activation energy of a reaction.
Enzymes are substrate-specific.
Enzymes can be regulated by inhibitors.
Enzymes remain unchanged after the reaction.
1

Enzymes lower the activation energy of a reaction, making it proceed faster.

Which of the following statements about phospholipids is correct?

Phospholipids are major components of cell membranes.
Phospholipids have hydrophilic tails and hydrophobic heads.
Phospholipids contain peptide bonds.
Phospholipids store genetic information.
1

Phospholipids are a key structural component of cell membranes, forming the lipid bilayer.

Which of the following statements about enzymes is incorrect?

They lower the activation energy of reactions
They remain unchanged after the reaction
They function at any pH and temperature
They are substrate-specific
3

Enzymes work within specific pH and temperature ranges. Extreme conditions can denature them.

Which class of lipids is an essential component of cell membranes?

Steroids
Phospholipids
Triglycerides
Waxes
2

Phospholipids form the bilayer structure of cell membranes, contributing to their fluidity and integrity.

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