Question

question 17
at certain times, plants have a cytokinesis - blocking plant cells, which have cell walls. what does the cytokinesis in a plant cell do that the cell wall cannot?
a. acts as a barrier, insulates the endosperm, cytoplasm and keeps it from collapsing.
b. helps keep the organelles in place and where they are needed.
c. provides energy and helps in many functions throughout the cell.
d. makes the dna (nucleus) in the nucleus and helps the nucleus function.
question 18
from these (mentioned) of a eukaryotic, a foreign (named) to do a contract and (mentioned) continue to the cell of a surviving (mentioned). the (mentioned) of the (mentioned) (named) for the (mentioned) (named) not on the (mentioned) being (named).

Explanation:

To solve this, we analyze the function of the cytoskeleton in plant cells (not able to do what the cell wall can't):

1. Recall the cell wall’s role: provides structural support, protection, and maintains cell shape.
2. Analyze cytoskeleton functions:

• Option A: The cytoskeleton (not the cell wall) helps in intracellular transport (e.g., vesicle movement) and organelle positioning. The cell wall is rigid and doesn’t mediate internal transport.
• Option B: The cell wall (not the cytoskeleton) provides rigidity/shape; the cytoskeleton is dynamic for internal support/movement.
• Option C: The cell wall (via plasmodesmata) and membrane facilitate cell - cell communication; the cytoskeleton is not the main mediator here.
• Option D: The cell wall (not the cytoskeleton) prevents excessive water intake (turgor regulation is via vacuole/cell wall pressure).

The cytoskeleton in plant cells is involved in intracellular transport (moving organelles, vesicles) and organizing the internal cell structure. The cell wall is rigid and cannot perform these dynamic internal transport - related functions. Option A describes a function unique to the cytoskeleton that the cell wall cannot do (as the cell wall is static and doesn't mediate internal organelle/vesicle movement). Options B, C, and D describe functions more associated with the cell wall or other structures, not the cytoskeleton's unique role relative to the cell wall.

Answer:

A. helps in intracellular transport and organelle positioning