Nokea
On what part of a light microscope is the slide placed?
- A. Base.
- B. Arm.
- C. stage
- D. Lens.
Correct Answer: C
Rationale:
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What is the purpose of cellular respiration?
- A. Produce enzymes.
- B. Produce oxygen molecules.
- C. Enable fermentation.
- D. Obtain energy in the form of ATP.
Correct Answer: D
Rationale:
Cells reproduce by different processes, all of which fall into what two categories?
- A. Sexual reproduction and binary fission
- B. Sexual reproduction and asexual reproduction
- C. Asexual reproduction and binary fission
- D. Asexual reproduction and mitosis
Correct Answer: B
Rationale: Cells can reproduce through sexual reproduction, involving the fusion of gametes, and asexual reproduction, which does not involve the fusion of gametes. Binary fission is a specific type of asexual reproduction where a cell divides into two identical cells. Therefore, the correct answer is B as it encompasses the broad categories of cellular reproduction processes, covering both sexual and asexual reproduction.
Which term means a group of similar cells combined to perform a common function?
- A. Tissue
- B. System.
- C. Organism.
- D. Organ.
Correct Answer: A
Rationale:
Cytosine (C) and Thymine (T) are known as:
- A. Purines
- B. Pyrimidines
- C. Both
- D. None of the above
Correct Answer: B
Rationale: Cytosine (C) and Thymine (T) are both pyrimidines. Purines, on the other hand, refer to adenine and guanine. Pyrimidines are characterized by a single-ring structure, while purines have a double-ring structure. Therefore, the correct answer is B: Pyrimidines. Remember, pyrimidines consist of cytosine and thymine, while purines include adenine and guanine.
Which combination of cell cycle phase and descriptor is correct?
- A. S phase - the cell synthesizes DNA and doubles its cytoplasm
- B. G� phase - the amount of chromosomes is doubled
- C. GÄ‚‚ phase - the phase prior to the start of mitosis in which the cell continues to grow in size and make proteins
- D. Interphase - the cell increases in mass and number of organelles to prepare for cell division
Correct Answer: C
Rationale: The correct answer is C. The GÄ‚‚ phase is the phase before mitosis within interphase where the cell grows in size and synthesizes proteins needed for cell division. Option A incorrectly describes the S phase, which is primarily for DNA synthesis. Option B is incorrect as the doubling of chromosomes does not occur in GÄ‚� phase. Option D is inaccurate because interphase encompasses GÄ‚�, S, and GÄ‚‚ phases, during which the cell prepares for division by increasing its mass and organelles, rather than specifically focusing on mitosis preparation.