Nokea
What is the function of water in photosynthesis?
- A. Combining with carbon dioxide
- B. Absorbing light energy
- C. Supplying electrons in the light reactions
- D. Transporting hydrogen ions in the dark reactions
Correct Answer: C
Rationale: Water is crucial in photosynthesis as it provides electrons during the light reactions. When water molecules are split in the light-dependent reactions, oxygen is released, and electrons are transferred to photosystem II to initiate the electron transport chain. This process is vital for the production of ATP and NADPH, which are necessary for the Calvin cycle to synthesize sugars.
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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.
What human tissue allows the body to move?
- A. Connective.
- B. Epithelial.
- C. Muscular.
- D. Nervous.
Correct Answer: C
Rationale: The correct answer is C: Muscular tissue. Muscular tissue is responsible for movement in the body as it contains specialized cells that can contract and relax, generating force to move body parts. Connective tissue (A) mainly provides support and structure, while epithelial tissue (B) functions in protection and absorption. Nervous tissue (D) transmits electrical signals but does not directly contribute to movement like muscular tissue does. Therefore, the correct choice is C as it is the only tissue type directly involved in body movement.
Are all bacteria bad, and do they always cause infections?
- A. TRUE
- B. FALSE
- C. Sometimes
- D. Not sure
Correct Answer: B
Rationale: The misconception that all bacteria are harmful and always cause infections is incorrect. Although some bacteria can lead to diseases, it is essential to note that not all bacteria are harmful. In reality, certain bacteria are beneficial and serve important functions in the body, such as aiding in digestion. Therefore, the correct answer is FALSE.
Which cellular appendage enables cells to move through their environments?
- A. Flagellum
- B. Cell membrane
- C. Transport protein
- D. Receptor
Correct Answer: A
Rationale: "Flagellum" is a whip-like appendage that allows certain cells to move through their environment.
Skin cells undergo what type of cellular division?
- A. Melosis.
- B. Binary fission.
- C. Sexual reproduction.
- D. Mitosis.
Correct Answer: D
Rationale: The correct answer is D: Mitosis. Skin cells undergo mitosis, a type of cellular division where a parent cell divides into two identical daughter cells. During mitosis, the genetic material is equally distributed between the daughter cells to ensure genetic stability. Melosis (A) is incorrect as it refers to the type of cell division that occurs during sexual reproduction to produce gametes. Binary fission (B) is incorrect as it is a form of asexual reproduction seen in prokaryotes. Sexual reproduction (C) is incorrect as it involves the fusion of gametes from two different parents to produce genetically diverse offspring, not the division of existing cells like in skin cells. In summary, mitosis is the correct choice for skin cell division as it maintains genetic continuity and ensures tissue growth and repair.