Which of the following is true about saturated fats?
a) They have double bonds in their fatty acid chains
b) They are liquid at room temperature
c) They have no double bonds in their fatty acid chains
d) They are primarily found in plants
Answer: c) They have no double bonds in their fatty acid chains

The active site of an enzyme is:
a) Where the substrate binds
b) The product of the reaction
c) The cofactor of the enzyme
d) The same as the substrate
Answer: a) Where the substrate binds

Which vitamin is synthesized in the skin in response to sunlight?
a) Vitamin A
b) Vitamin D
c) Vitamin C
d) Vitamin E
Answer: b) Vitamin D

Which of the following is the storage form of glucose in animals?
a) Starch
b) Glycogen
c) Cellulose
d) Fructose
Answer: b) Glycogen

The enzyme that unwinds the DNA helix during replication is:
a) DNA ligase
b) DNA polymerase
c) Helicase
d) RNA polymerase
Answer: c) Helicase

Which of the following macromolecules serves as the genetic material in cells?
a) Proteins
b) Carbohydrates
c) Nucleic acids
d) Lipids
Answer: c) Nucleic acids

Which process is used to synthesize glucose from non-carbohydrate precursors?
a) Glycolysis
b) Gluconeogenesis
c) Fermentation
d) Photosynthesis
Answer: b) Gluconeogenesis

What is the primary function of insulin?
a) To raise blood glucose levels
b) To store fat
c) To lower blood glucose levels
d) To break down proteins
Answer: c) To lower blood glucose levels

Which of the following is a non-essential amino acid?
a) Lysine
b) Methionine
c) Alanine
d) Tryptophan
Answer: c) Alanine

Which of the following is true about DNA replication?
a) It occurs in the cytoplasm
b) It results in two identical DNA molecules
c) It produces mRNA
d) It occurs during mitosis
Answer: b) It results in two identical DNA molecules