BIO 201 – Midterm Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Which of the following is the basic unit of life?
a. Atom
b. Molecule
c. Cell
d. Organ
The cell is the fundamental structural and functional unit of all
living organisms.
2. DNA is composed of:
a. Amino acids
b. Nucleotides
c. Monosaccharides
d. Fatty acids
DNA is a polymer of nucleotides, each consisting of a sugar,
phosphate, and nitrogenous base.
3. Which organelle is responsible for producing ATP?
a. Nucleus
b. Ribosome
c. Mitochondria
d. Golgi apparatus
, Mitochondria are the site of cellular respiration and ATP
production.
4. Proteins are synthesized in the:
a. Ribosomes
b. Endoplasmic reticulum
c. Lysosomes
d. Nucleus
Ribosomes translate mRNA into polypeptide chains, forming
proteins.
5. Which type of bond holds the two strands of DNA together?
a. Covalent
b. Ionic
c. Hydrogen
d. Peptide
Hydrogen bonds form between complementary base pairs in DNA,
stabilizing the double helix.
6. The process of transcription occurs in the:
a. Cytoplasm
b. Nucleus
c. Ribosome
d. Mitochondria
Transcription involves copying DNA into mRNA inside the nucleus.
7. Which phase of mitosis involves the alignment of chromosomes
along the metaphase plate?
a. Prophase
b. Metaphase
c. Anaphase
, d. Telophase
During metaphase, chromosomes line up at the cell’s equator for
proper segregation.
8. What is the complementary mRNA sequence for the DNA
template 3’-ATGC-5’?
a. 5’-TACG-3’
b. 5’-UACG-3’
c. 5’-AUGC-3’
d. 3’-UACG-5’
mRNA uses uracil instead of thymine, complementing the DNA
template strand.
9. Enzymes function by:
a. Providing energy
b. Being consumed in reactions
c. Lowering activation energy
d. Changing equilibrium
Enzymes accelerate chemical reactions by reducing the activation
energy needed.
10. Which macromolecule serves as the main source of energy
for cells?
a. Carbohydrates
b. Lipids
c. Proteins
d. Nucleic acids
Carbohydrates, particularly glucose, are primary energy sources in
cells.
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the basic unit of life?
a. Atom
b. Molecule
c. Cell
d. Organ
The cell is the fundamental structural and functional unit of all
living organisms.
2. DNA is composed of:
a. Amino acids
b. Nucleotides
c. Monosaccharides
d. Fatty acids
DNA is a polymer of nucleotides, each consisting of a sugar,
phosphate, and nitrogenous base.
3. Which organelle is responsible for producing ATP?
a. Nucleus
b. Ribosome
c. Mitochondria
d. Golgi apparatus
, Mitochondria are the site of cellular respiration and ATP
production.
4. Proteins are synthesized in the:
a. Ribosomes
b. Endoplasmic reticulum
c. Lysosomes
d. Nucleus
Ribosomes translate mRNA into polypeptide chains, forming
proteins.
5. Which type of bond holds the two strands of DNA together?
a. Covalent
b. Ionic
c. Hydrogen
d. Peptide
Hydrogen bonds form between complementary base pairs in DNA,
stabilizing the double helix.
6. The process of transcription occurs in the:
a. Cytoplasm
b. Nucleus
c. Ribosome
d. Mitochondria
Transcription involves copying DNA into mRNA inside the nucleus.
7. Which phase of mitosis involves the alignment of chromosomes
along the metaphase plate?
a. Prophase
b. Metaphase
c. Anaphase
, d. Telophase
During metaphase, chromosomes line up at the cell’s equator for
proper segregation.
8. What is the complementary mRNA sequence for the DNA
template 3’-ATGC-5’?
a. 5’-TACG-3’
b. 5’-UACG-3’
c. 5’-AUGC-3’
d. 3’-UACG-5’
mRNA uses uracil instead of thymine, complementing the DNA
template strand.
9. Enzymes function by:
a. Providing energy
b. Being consumed in reactions
c. Lowering activation energy
d. Changing equilibrium
Enzymes accelerate chemical reactions by reducing the activation
energy needed.
10. Which macromolecule serves as the main source of energy
for cells?
a. Carbohydrates
b. Lipids
c. Proteins
d. Nucleic acids
Carbohydrates, particularly glucose, are primary energy sources in
cells.
