Nokea
A pencil measures 8 cm long. What is this length in mm?
- A. 80 mm
- B. 800 mm
- C. 8 mm
- D. 0.8 mm
Correct Answer: A
Rationale: To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in 1 centimeter. Therefore, 8 cm x 10 = 80 mm. The correct answer is 80 mm.
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What structure allows sperm cells to move?
- A. Centriole.
- B. Centrosome.
- C. Flagellum.
- D. Cilium.
Correct Answer: C
Rationale:
Why does cytokinesis occur?
- A. DNA replication occurs
- B. Organelles generate energy
- C. Bacteria are eliminated
- D. Daughter cells can separate
Correct Answer: D
Rationale: Cytokinesis is the process of separating daughter cells at the end of cell division. It ensures that the newly formed cells can function independently. Choice A is incorrect because DNA duplication occurs during the S phase of the cell cycle, not during cytokinesis. Choice B is incorrect as organelles converting energy is not the primary purpose of cytokinesis. Choice C is irrelevant as the elimination of bacteria is not related to cytokinesis.
In a phospholipid, the head:
- A. Is hydrophilic
- B. Is hydrophobic
- C. Faces the outer side of the layer
- D. Both A and C
Correct Answer: D
Rationale: The head of a phospholipid is hydrophilic, meaning it is water-loving, and faces the outer side of the lipid bilayer. This arrangement allows the hydrophilic head to interact with water while the hydrophobic tails are shielded from it. Therefore, option D, 'Both A and C,' is the correct answer as the head is hydrophilic and faces the outer side of the layer.
Which of the following options best represents complementary base pairing in DNA?
- A. A and G
- B. A and C
- C. A and A
- D. A and T
Correct Answer: D
Rationale: In DNA, adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C). This is known as complementary base pairing. The correct answer is 'A and T' because they form a complementary base pair in DNA. Adenine always pairs with thymine via two hydrogen bonds, while guanine pairs with cytosine via three hydrogen bonds. This base pairing specificity is crucial for DNA replication and genetic information transfer.
Which option demonstrates complementary base pairing in DNA?
- A. A and G
- B. A and C
- C. A and A
- D. A and T
Correct Answer: D
Rationale: In DNA, adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G). This is known as complementary base pairing. Adenine always pairs with thymine via two hydrogen bonds, forming a strong bond essential for DNA structure and replication. Therefore, the correct option that demonstrates complementary base pairing in DNA is A and T (D). This pairing is crucial during DNA replication and ensures the accurate transmission of genetic information.