Question

cell organelles
organelles within a cell work together to maintain homeostasis. the model shows an animal cell with the nucleus, cytoplasm, and a mitochondrion labelled.

1. how does the nucleus contribute to maintaining homeostasis for the cell?

a. the nucleus stores water and food for the cell.
b. the nucleus directs cellular activities for the cell.
c. the nucleus produces chemical energy for the cell.
d. the nucleus packages and sorts proteins for the cell.

1. which feature do plant and animal cells have in common?

a. they take in energy from the sun.
b. they are able to make their own food.
c. they are green and shaped like rectangles.
d. they take in energy and release waste products to live.

Explanation:

Question 17

• Option A: Vacuoles (not nucleus) store water and food. Eliminate A.
• Option B: The nucleus contains DNA and directs cellular activities (like protein synthesis, cell division) which helps maintain homeostasis. This is correct.
• Option C: Mitochondria produce chemical energy (ATP), not the nucleus. Eliminate C.
• Option D: The Golgi apparatus packages and sorts proteins, not the nucleus. Eliminate D.

• Option A: Only plant cells (with chloroplasts) take in energy from the sun for photosynthesis. Animal cells do not. Eliminate A.
• Option B: Only plant cells can make their own food (photosynthesis). Animal cells consume food. Eliminate B.
• Option C: Plant cells may be green (due to chlorophyll) and rectangular, but animal cells are not green or rectangular. Eliminate C.
• Option D: Both plant and animal cells need energy (e.g., from glucose) and release waste (e.g., CO₂, urea) to survive. This is a common feature.

Answer:

B. The nucleus directs cellular activities for the cell.

Question 18