Question

question 39 (1 point)
which organelle controls what comes in and out of the cell and can be found in all cell types?
○ a vacuole
○ b nucleus
○ c cell wall
○ d cell membrane

question 40 (1 point)
a number of scientists made contributions to cell theory. which scientist used a light microscope to observe cells in a slice of cork?
○ a theodor schwann
○ b matthias schleiden
○ c robert hooke
○ d anton van leeuwenhoek

Explanation:

Question 39

• Vacuole stores substances, not control entry/exit.
• Nucleus controls cell activities, not entry/exit.
• Cell wall (in plant/fungi) is rigid, not in all cells.
• Cell membrane is semi - permeable, controls transport, present in all cells.

• Theodor Schwann studied animal cells.
• Matthias Schleiden studied plant cells.
• Robert Hooke used a light microscope on cork, coined "cell".
• Anton van Leeuwenhoek observed microorganisms.

Answer:

d. cell membrane

Question 40