Nokea
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.
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Which process is the movement of particles from a high concentration to a low concentration?
- A. Diffusion.
- B. Filtration.
- C. Osmosis.
- D. Facilitation.
Correct Answer: A
Rationale: Correct Answer: A (Diffusion)
Rationale:
1. Diffusion is the movement of particles from areas of high concentration to low concentration.
2. This process occurs due to random movement of particles until equilibrium is reached.
3. Filtration is the movement of particles through a barrier due to pressure differences.
4. Osmosis is the movement of water molecules across a semi-permeable membrane.
5. Facilitation involves the assistance of carrier proteins in the movement of particles.
Summary:
Diffusion is the correct answer as it aligns with the movement of particles from high to low concentration. Filtration, osmosis, and facilitation involve different mechanisms and are not specifically related to concentration gradients.
Which characteristic is true of prokaryotic cells?
- A. Have a nucleus
- B. Have a capsule
- C. Have membrane-bound organelles
- D. Cannot move on their own
Correct Answer: B
Rationale: Prokaryotic cells are characterized by the absence of a nucleus; instead, they have a nucleoid region where the genetic material is located. Prokaryotic cells often have a capsule, a protective layer outside the cell wall that plays a role in protection and adherence to surfaces. While eukaryotic cells have membrane-bound organelles, prokaryotic cells lack these membrane-bound structures. Prokaryotic cells are capable of movement, facilitated by structures like flagella or pili.
On what part of a light microscope is the slide placed?
- A. Base.
- B. Arm.
- C. stage
- D. Lens.
Correct Answer: C
Rationale:
What cellular appendage enables cells to move through their environments?
- A. Flagellum
- B. Cell membrane
- C. Transport protein
- D. Receptor
Correct Answer: A
Rationale: The flagellum is a whip-like appendage found in certain cells like sperm cells and some bacteria, enabling them to move through their environments. It plays a crucial role in locomotion by allowing cells to swim or propel themselves in liquids, aiding in their movement and navigation.
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.