. 1.Which of the following best describes the function of ribosomes in
eukaryotic cells?
A) They synthesize lipids
B) They are the site of cellular respiration
C) They catalyze the formation of proteins from amino acids
D) They help in cell division
Answer: C) They catalyze the formation of proteins from amino acids
Rationale: Ribosomes are responsible for protein synthesis in
eukaryotic cells. They translate mRNA into amino acid sequences,
forming proteins. This process is called translation and occurs in the
cytoplasm or on the rough endoplasmic reticulum.
1. Which of the following molecules is responsible for storing and
transferring genetic information in cells?
A. Proteins
B. Carbohydrates
C. Nucleic acids
D. Lipids
Answer: C) Nucleic acids
Rationale: Nucleic acids (DNA and RNA) store and transfer genetic
information. DNA carries the genetic code, while RNA plays a key role
in translating this code into proteins.
2. Which of the following is an example of a homologous structure?
A. The wings of a bat and the wings of a bird
B. The flippers of a whale and the legs of a dog
,C. The eyes of a squid and the eyes of a human
D. The beak of a hummingbird and the beak of a crow
Answer: B) The flippers of a whale and the legs of a dog
Rationale: Homologous structures are body parts that have a similar
evolutionary origin but may serve different functions. The flippers of a
whale and the legs of a dog both derive from a common ancestor with
similar limb structure.
3. Which of the following organelles is responsible for producing ATP
in eukaryotic cells?
A. Nucleus
B. Mitochondria
C. Golgi apparatus
D. Lysosomes
Answer: B) Mitochondria
Rationale: Mitochondria are the sites of cellular respiration, where
ATP is produced through oxidative phosphorylation.
4. Which type of RNA is responsible for carrying amino acids to the
ribosome during translation?
A. mRNA
B. rRNA
C. tRNA
D. miRNA
Answer: C) tRNA
, Rationale: Transfer RNA (tRNA) brings amino acids to the ribosome,
where they are added to the growing polypeptide chain during protein
synthesis.
5. Which of the following best describes the function of the enzyme
helicase during DNA replication?
A. It synthesizes new DNA strands
B. It binds the two DNA strands together
C. It unwinds the double helix of DNA
D. It seals breaks in the DNA backbone
Answer: C) It unwinds the double helix of DNA
Rationale: Helicase unwinds the DNA double helix, separating the two
strands to make them available for replication.
6. Which of the following best describes the role of the enzyme DNA
polymerase during DNA replication?
A. It unwinds the DNA double helix
B. It synthesizes a new strand of DNA by adding nucleotides
C. It joins Okazaki fragments together
D. It separates the daughter chromosomes during mitosis
Answer: B) It synthesizes a new strand of DNA by adding nucleotides
Rationale: DNA polymerase is responsible for adding complementary
nucleotides to the growing strand of DNA during replication, ensuring
accurate copying of the genetic material.
eukaryotic cells?
A) They synthesize lipids
B) They are the site of cellular respiration
C) They catalyze the formation of proteins from amino acids
D) They help in cell division
Answer: C) They catalyze the formation of proteins from amino acids
Rationale: Ribosomes are responsible for protein synthesis in
eukaryotic cells. They translate mRNA into amino acid sequences,
forming proteins. This process is called translation and occurs in the
cytoplasm or on the rough endoplasmic reticulum.
1. Which of the following molecules is responsible for storing and
transferring genetic information in cells?
A. Proteins
B. Carbohydrates
C. Nucleic acids
D. Lipids
Answer: C) Nucleic acids
Rationale: Nucleic acids (DNA and RNA) store and transfer genetic
information. DNA carries the genetic code, while RNA plays a key role
in translating this code into proteins.
2. Which of the following is an example of a homologous structure?
A. The wings of a bat and the wings of a bird
B. The flippers of a whale and the legs of a dog
,C. The eyes of a squid and the eyes of a human
D. The beak of a hummingbird and the beak of a crow
Answer: B) The flippers of a whale and the legs of a dog
Rationale: Homologous structures are body parts that have a similar
evolutionary origin but may serve different functions. The flippers of a
whale and the legs of a dog both derive from a common ancestor with
similar limb structure.
3. Which of the following organelles is responsible for producing ATP
in eukaryotic cells?
A. Nucleus
B. Mitochondria
C. Golgi apparatus
D. Lysosomes
Answer: B) Mitochondria
Rationale: Mitochondria are the sites of cellular respiration, where
ATP is produced through oxidative phosphorylation.
4. Which type of RNA is responsible for carrying amino acids to the
ribosome during translation?
A. mRNA
B. rRNA
C. tRNA
D. miRNA
Answer: C) tRNA
, Rationale: Transfer RNA (tRNA) brings amino acids to the ribosome,
where they are added to the growing polypeptide chain during protein
synthesis.
5. Which of the following best describes the function of the enzyme
helicase during DNA replication?
A. It synthesizes new DNA strands
B. It binds the two DNA strands together
C. It unwinds the double helix of DNA
D. It seals breaks in the DNA backbone
Answer: C) It unwinds the double helix of DNA
Rationale: Helicase unwinds the DNA double helix, separating the two
strands to make them available for replication.
6. Which of the following best describes the role of the enzyme DNA
polymerase during DNA replication?
A. It unwinds the DNA double helix
B. It synthesizes a new strand of DNA by adding nucleotides
C. It joins Okazaki fragments together
D. It separates the daughter chromosomes during mitosis
Answer: B) It synthesizes a new strand of DNA by adding nucleotides
Rationale: DNA polymerase is responsible for adding complementary
nucleotides to the growing strand of DNA during replication, ensuring
accurate copying of the genetic material.
