Question

question 16
which of the following do not play a role in intracellular movement?
only intermediate filaments
microfilaments and intermediate filaments
microfilaments and microtubules
microtubules only
intermediate filaments and microtubules
question 17
in humans, __ are used to move a cell within its environment while __ are to move the environment relative to the cell.
flagella; cilia
microtubules; flagella
microtubules; intermediate filaments
microfilaments; microtubules
cilia, pseudopodia
question 18
which of the following are only in plant cells?
desmosomes
tight junctions
gap junctions
plasmodesmata
mitochondrion

Explanation:

• Question 16: Microfilaments and microtubules are involved in intracellular movement. Intermediate filaments mainly provide structural support and do not play a direct role in intracellular movement.
• Question 17: In humans, flagella can move a cell within its environment (e.g., sperm cell movement), and cilia can move the environment relative to the cell (e.g., moving mucus in the respiratory tract).
• Question 18: Plasmodesmata are cell - to - cell junctions that are unique to plant cells. Desmosomes, tight junctions, and gap junctions are found in animal cells, and mitochondria are present in both plant and animal cells.

Answer:

• Question 16: only intermediate filaments
• Question 17: flagella; cilia
• Question 18: plasmodesmata