Biomolecules Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about nucleic acids is correct?

DNA and RNA are composed of amino acids.
DNA contains deoxyribose, whereas RNA contains ribose.
RNA contains thymine instead of uracil.
DNA is single-stranded in most organisms.
2

DNA contains deoxyribose sugar, while RNA contains ribose. DNA is double-stranded, and RNA has uracil instead of thymine.

Which of the following is a function of nucleotides other than being structural components of nucleic acids?

Energy carriers
Catalysts
Hormones
Structural proteins
1

Some nucleotides, like ATP and GTP, function as energy carriers in cellular metabolism.

Which of the following statements about phospholipids is incorrect?

Phospholipids are major components of cell membranes.
Phospholipids have hydrophobic tails and hydrophilic heads.
Phospholipids store genetic information.
Phospholipids form bilayers in aqueous solutions.
3

Phospholipids form structural components of cell membranes but do not store genetic information.

Which biomolecule serves as the primary energy source in most organisms?

Lipids
Proteins
Carbohydrates
Nucleic acids
3

Carbohydrates serve as the primary energy source for most organisms, providing immediate energy through glucose metabolism.

Which of the following statements about coenzymes is incorrect?

Coenzymes are organic molecules that assist enzyme function.
Some vitamins function as coenzymes.
Coenzymes are always permanently bound to enzymes.
NAD+ and FAD are examples of coenzymes.
3

Coenzymes are often loosely bound to enzymes and can be reused; they are not always permanently attached.

Which of the following is NOT an essential amino acid?

Valine
Lysine
Glycine
Leucine
3

Glycine is a non-essential amino acid because the human body can synthesize it.

Which of the following statements about amino acids is incorrect?

Amino acids are the building blocks of proteins.
All amino acids contain an amino group and a carboxyl group.
Amino acids do not contain nitrogen.
Amino acids can be essential or non-essential.
3

Amino acids contain nitrogen in their amino (-NH₂) group.

Which of the following statements about enzymes is incorrect?

Enzymes function as biological catalysts.
Enzymes increase the rate of chemical reactions.
Enzymes are consumed in reactions and cannot be reused.
Enzymes lower activation energy.
3

Enzymes are not consumed in reactions; they remain unchanged and can be reused.

Which enzyme is responsible for catalyzing the conversion of carbon dioxide and water into carbonic acid?

Pepsin
Amylase
Carbonic anhydrase
Lipase
3

Carbonic anhydrase catalyzes the conversion of carbon dioxide and water into carbonic acid.

Which of the following statements about carbohydrates is correct?

Starch and glycogen are structural polysaccharides.
Monosaccharides are the simplest form of carbohydrates.
Cellulose is a storage polysaccharide in animals.
Polysaccharides are composed of amino acids.
2

Monosaccharides are the basic building blocks of carbohydrates. Starch and glycogen are storage, not structural, polysaccharides.

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