Question

cells are specialized to do certain jobs. for instance, muscle cells are in constant motion and require a lot of energy to work. muscle cells contain more of which organelle?

a. cell wall because it produces energy for the cell

b. chloroplasts because they produce energy for the cell

c. cell membrane because it produces energy for the cell

d. mitochondria because they produce energy for the cell

Explanation:

1. Analyze Option A: Cell walls are present in plant cells (and some prokaryotes/fungi), not animal muscle cells. Also, cell walls don’t produce energy. Eliminate A.
2. Analyze Option B: Chloroplasts are in plant cells (for photosynthesis) and not in animal muscle cells. Eliminate B.
3. Analyze Option C: The cell membrane is for protection/transport, not energy production. Eliminate C.
4. Analyze Option D: Mitochondria are the "powerhouses" of cells, producing ATP (energy). Muscle cells need lots of energy, so they have more mitochondria. This matches.

Answer:

D. mitochondria because they produce energy for the cell