Nokea
What part of a light microscope is used to hold the slide in place?
- A. Base
- B. Arm
- C. Rack stop
- D. Stage clips
Correct Answer: D
Rationale: The correct answer is 'Stage clips.' Stage clips are utilized to secure the slide on the stage of a light microscope, ensuring it remains in position while examining the specimen. The base of the microscope provides stability, the arm supports the upper part of the microscope, and the rack stop restricts the movement of the stage. However, specifically, it is the stage clips that hold the slide in place during observations.
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What is the function of water in photosynthesis?
- A. Combine with carbon dioxide
- B. Absorb light energy
- C. Supply electrons in the light reactions
- D. Transport hydrogen ions in the dark reactions
Correct Answer: C
Rationale: Water plays a crucial role in photosynthesis by supplying electrons in the light reactions of the process. During the light reactions of photosynthesis, water molecules are split, releasing oxygen and providing electrons that are used to drive the production of energy-rich molecules like ATP and NADPH. This electron transfer process is essential for converting light energy into chemical energy, which is then used in the subsequent steps of photosynthesis to produce glucose and other organic compounds.
Aerobic respiration occurs in the presence of what necessary molecule?
- A. Carbon Dioxide
- B. Water
- C. Glucose
- D. Oxygen
Correct Answer: D
Rationale: Oxygen is essential for aerobic respiration as it acts as the final electron acceptor in the electron transport chain, producing ATP
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.
Why do cells need to use exocytosis?
- A. To obtain energy
- B. To defend against invaders
- C. To eliminate waste
- D. To undergo cell division
Correct Answer: C
Rationale: Cells use exocytosis to eliminate waste from the cell. Exocytosis is the process by which cells expel waste materials or products outside the cell. This process helps maintain cellular cleanliness and proper functioning by preventing the accumulation of harmful substances inside the cell, ensuring the cell's health and survival.
Which of the following is not found within a bacterial cell?
- A. mitochondria
- B. DNA
- C. vesicles
- D. ribosome
Correct Answer: A
Rationale: Mitochondria are organelles found in eukaryotic cells, not in bacterial cells. Bacterial cells lack membrane-bound organelles like mitochondria. Choices B, C, and D are all components that can be found within a bacterial cell. DNA is the genetic material that carries the instructions for cell function, vesicles are involved in transport and storage of substances, and ribosomes are responsible for protein synthesis in bacterial cells.