Nokea
Where in the cell does the Krebs cycle take place?
- A. mitochondrion.
- B. Nucleus.
- C. Cytoplasm.
- D. Chloroplast.
Correct Answer: A
Rationale:
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Which of the following statements is false?
- A. Animal cells use lysosomes to break down old cells
- B. Animal cells use chloroplasts to gain energy
- C. Plant cells have a cell wall to maintain structure
- D. All of the above are true
Correct Answer: B
Rationale: The correct statement is B. Animal cells do not use chloroplasts to gain energy; instead, they rely on mitochondria for energy production through cellular respiration. Lysosomes in animal cells are responsible for breaking down old cells and cellular waste. Plant cells have a cell wall to provide structural support and protection. Therefore, option B is false, as animal cells do not utilize chloroplasts for energy.
What type of bond holds water molecules together?
- A. Ionic
- B. Covalent
- C. Hydrogen
- D. Molecular
Correct Answer: C
Rationale: The correct answer is 'Hydrogen.' Water molecules are held together by hydrogen bonds. These bonds form between the slightly positive hydrogen atom of one water molecule and the slightly negative oxygen atom of another water molecule. While hydrogen bonds are weaker than covalent bonds, they play a crucial role in various biological processes, such as the cohesion of water molecules and the unique properties of water as a solvent.
How does the concentration of solutes in a hypertonic solution compare to the cell's?
- A. Same as
- B. Lower than
- C. Higher than
- D. Negative
Correct Answer: C
Rationale: In a hypertonic solution, the concentration of solutes is higher compared to the cell's interior. This causes water to move out of the cell to balance the solute concentrations, resulting in the cell shrinking. Therefore, the correct answer is that the solute concentration is higher in a hypertonic solution than inside the cell.
What type of bond holds molecules of water together with other water molecules?
- A. Ionic
- B. Covalent
- C. Hydrogen
- D. Molecular
Correct Answer: C
Rationale: The correct answer is 'C: Hydrogen.' Molecules of water are held together by hydrogen bonds. These bonds form between the hydrogen atom of one water molecule and the oxygen atom of another water molecule. Hydrogen bonds are weaker than covalent bonds but are crucial in various biological processes, such as maintaining the unique properties of water and facilitating specific interactions in biological molecules.
Which is an example of the correct organizational hierarchy for a wolf?
- A. Muscle tissue, blood cell, DNA, organ, circulatory system, wolf
- B. DNA, blood cell, muscle tissue, heart, circulatory system, wolf
- C. Circulatory system, DNA, muscle tissue, blood cell, heart, wolf
- D. Blood cell, organ, circulatory system, muscle tissue, DNA, wolf
Correct Answer: B
Rationale: The correct organizational hierarchy in biology follows a specific order from smallest to largest. It starts with DNA (genetic material), followed by blood cells (basic units of life), then muscle tissue (a collection of cells), followed by the heart (an organ), then the circulatory system (a system of organs), and finally the whole organism, the wolf. Therefore, the correct sequence for the organizational hierarchy for a wolf is DNA, blood cell, muscle tissue, heart, circulatory system, and wolf.