Nokea
Which combination of cell cycle phase and descriptor is correct?
- A. S phase - the cell synthesizes DNA and doubles its cytoplasm.
- B. Interphase - the cell increases in mass and number of organelles to prepare for cell division.
- C. G1 phase - the phase prior to the start of mitosis in which the cell continues to grow in size and make proteins.
- D. G2 phase - the amount of chromosomes is doubled.
Correct Answer: C
Rationale:
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In the presence of which molecule does aerobic respiration occur?
- A. Oxygen
- B. Lactic acid
- C. Carbon dioxide
- D. Water
Correct Answer: A
Rationale: Aerobic respiration is a process that requires oxygen to efficiently convert glucose into carbon dioxide, water, and ATP. Oxygen plays a critical role in this metabolic pathway by acting as the final electron acceptor in the electron transport chain, allowing the production of ATP through oxidative phosphorylation. Therefore, oxygen is the essential molecule for aerobic respiration to take place.
In the scenario presented in question #49, what type of solution is the egg immersed in?
- A. Hypertonic
- B. Isotonic
- C. Hypotonic
- D. None of the above
Correct Answer: A
Rationale: When an egg is placed in a hypertonic solution, water moves out of the egg into the surrounding solution due to the higher concentration of solutes outside the egg. This results in the egg shrinking or shriveling up as water leaves it, indicating a hypertonic environment.
What structure allows sperm cells to move?
- A. Centriole.
- B. Centrosome.
- C. Flagellum.
- D. Cilium.
Correct Answer: C
Rationale:
How does water affect the temperature of a living thing?
- A. Water increases temperature.
- B. Water helps keep temperature stable.
- C. Water decreases temperature.
- D. Water does not affect temperature.
Correct Answer: B
Rationale: Water has a high specific heat capacity, meaning it can absorb and release a large amount of heat with minimal temperature change. This property allows water to regulate and stabilize the temperature of living things by absorbing excess heat or providing warmth when releasing stored heat. Therefore, choice B, 'Water helps keep temperature stable,' is the correct answer.
Enzymes can ................. reactions.
- A. Catalyze
- B. Inhibit
- C. Stop
- D. None of the above
Correct Answer: A
Rationale: Enzymes function to catalyze reactions, which means they accelerate the rate of chemical reactions without being consumed in the process. Enzymes do not inhibit or stop reactions; instead, they facilitate and enable reactions to occur more efficiently. Therefore, the correct answer is 'Catalyze.'