Which of the following macromolecules is primarily involved in catalyzing chemical reactions?
a) Carbohydrates
b) Lipids
c) Proteins
d) Nucleic acids
Answer: c) Proteins

Which of the following is not a nucleotide found in DNA?
a) Adenine
b) Thymine
c) Uracil
d) Cytosine
Answer: c) Uracil

Which of the following molecules is a reducing sugar?
a) Glucose
b) Starch
c) Cellulose
d) Sucrose
Answer: a) Glucose

The enzyme that adds nucleotides to a growing DNA strand during replication is:
a) DNA ligase
b) RNA polymerase
c) DNA polymerase
d) Helicase
Answer: c) DNA polymerase

Which of the following is an example of an essential fatty acid?
a) Oleic acid
b) Linoleic acid
c) Stearic acid
d) Palmitic acid
Answer: b) Linoleic acid

Which molecule is used to store energy in the liver and muscles?
a) Glucose
b) Glycogen
c) ATP
d) Fructose
Answer: b) Glycogen

The amino acid sequence of a protein determines its:
a) pH
b) Function
c) Color
d) Water content
Answer: b) Function

Which of the following is a function of vitamin D?
a) Blood clotting
b) Antioxidant
c) Calcium absorption
d) Vision improvement
Answer: c) Calcium absorption

Which of the following is not a component of a phospholipid?
a) Glycerol
b) Fatty acids
c) Phosphate group
d) Amino acid
Answer: d) Amino acid