AC-HPAT ExAm 2024 ACTuAl ExAm 2026/2027 – OffiCiAl BluEPrinT
rEPliCA wiTH DETAilED rATiOnAlEs | rAnDOm QuEsTiOn OrDEr |
PAss GuArAnTEED – A+ GrADED
**1.** Which organelle is known as the ‘powerhouse of the cell’ for its role in energy production?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Answer: C
Rationale: The mitochondrion is the site of cellular respiration, a process that converts glucose and
oxygen into ATP, the cell's main energy currency. The nucleus stores genetic information, the Golgi
apparatus packages proteins, and ribosomes synthesize them.
**2.** The process of programmed cell death, which is a normal part of an organism's growth and
development, is called:
A) Apoptosis
B) Mitosis
C) Necrosis
D) Cytokinesis
Answer: A
Rationale: Apoptosis is a controlled and orderly process that eliminates old, unnecessary, or damaged
cells. Mitosis is cell division for growth and repair, while necrosis is premature cell death caused by injury
or infection. Cytokinesis is the physical division of the cell's cytoplasm after mitosis.
**3.** Which of the following best describes the function of the ribosome?
A) Lipid synthesis
B) Energy production
C) Protein synthesis
, D) Waste digestion
Answer: C
Rationale: Ribosomes are small cellular structures that translate genetic instructions from messenger
RNA (mRNA) to assemble amino acids into polypeptide chains, which then fold into functional proteins.
**4.** What type of macromolecule are enzymes primarily classified as?
A) Carbohydrates
B) Lipids
C) Nucleic acids
D) Proteins
Answer: D
Rationale: Enzymes are biological catalysts that speed up chemical reactions by lowering activation
energy. They are almost always proteins, though some RNA molecules also have catalytic activity
(ribozymes).
**5.** During which phase of the cell cycle does DNA replication occur?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Answer: B
Rationale: The cell cycle consists of interphase (G1, S, G2) and mitosis (M). DNA synthesis, or replication,
occurs exclusively during the S phase. The G1 and G2 phases are for growth and protein synthesis, while
the M phase is for nuclear division.
**6.** Which of the following is a key difference between prokaryotic and eukaryotic cells?
A) Prokaryotes have a nucleus; eukaryotes do not
B) Prokaryotes have membrane-bound organelles; eukaryotes do not
C) Prokaryotes lack a nucleus and membrane-bound organelles; eukaryotes have both
D) Prokaryotes are always multicellular; eukaryotes are always unicellular
rEPliCA wiTH DETAilED rATiOnAlEs | rAnDOm QuEsTiOn OrDEr |
PAss GuArAnTEED – A+ GrADED
**1.** Which organelle is known as the ‘powerhouse of the cell’ for its role in energy production?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Answer: C
Rationale: The mitochondrion is the site of cellular respiration, a process that converts glucose and
oxygen into ATP, the cell's main energy currency. The nucleus stores genetic information, the Golgi
apparatus packages proteins, and ribosomes synthesize them.
**2.** The process of programmed cell death, which is a normal part of an organism's growth and
development, is called:
A) Apoptosis
B) Mitosis
C) Necrosis
D) Cytokinesis
Answer: A
Rationale: Apoptosis is a controlled and orderly process that eliminates old, unnecessary, or damaged
cells. Mitosis is cell division for growth and repair, while necrosis is premature cell death caused by injury
or infection. Cytokinesis is the physical division of the cell's cytoplasm after mitosis.
**3.** Which of the following best describes the function of the ribosome?
A) Lipid synthesis
B) Energy production
C) Protein synthesis
, D) Waste digestion
Answer: C
Rationale: Ribosomes are small cellular structures that translate genetic instructions from messenger
RNA (mRNA) to assemble amino acids into polypeptide chains, which then fold into functional proteins.
**4.** What type of macromolecule are enzymes primarily classified as?
A) Carbohydrates
B) Lipids
C) Nucleic acids
D) Proteins
Answer: D
Rationale: Enzymes are biological catalysts that speed up chemical reactions by lowering activation
energy. They are almost always proteins, though some RNA molecules also have catalytic activity
(ribozymes).
**5.** During which phase of the cell cycle does DNA replication occur?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Answer: B
Rationale: The cell cycle consists of interphase (G1, S, G2) and mitosis (M). DNA synthesis, or replication,
occurs exclusively during the S phase. The G1 and G2 phases are for growth and protein synthesis, while
the M phase is for nuclear division.
**6.** Which of the following is a key difference between prokaryotic and eukaryotic cells?
A) Prokaryotes have a nucleus; eukaryotes do not
B) Prokaryotes have membrane-bound organelles; eukaryotes do not
C) Prokaryotes lack a nucleus and membrane-bound organelles; eukaryotes have both
D) Prokaryotes are always multicellular; eukaryotes are always unicellular
