Question

cells contain smaller parts known as organelles. the nucleus, chloroplasts, mitochondria, and vacuoles are all examples of organelles. what do these organelles have in common? a. they are all enclosed by a membrane. b. they are found in all animal cells. c. they all serve the same function. d. they are found in all plant cells.

Explanation:

• Option A: The nucleus, chloroplasts, mitochondria, and vacuoles are all membrane - enclosed organelles (nuclear membrane, chloroplast membrane, mitochondrial membrane, and vacuole membrane).
• Option B: Chloroplasts are not found in animal cells, so this is incorrect.
• Option C: Each of these organelles has a distinct function (nucleus for genetic control, chloroplasts for photosynthesis, mitochondria for respiration, vacuoles for storage etc.), so they do not serve the same function.
• Option D: Animal cells also have vacuoles (though different from plant vacuoles in some aspects), and chloroplasts are not found in all plant cells (e.g., root cells), so this is incorrect.

Answer:

A. They are all enclosed by a membrane.