Question

1. which structure controls what enters and leaves the cell?

a. nucleus
b. cell wall
c. cytoplasm
d. cell membrane

1. diffusion is the movement of molecules—

a. against the concentration gradient
b. from low to high concentration
c. from high to low concentration
d. using cellular energy

1. osmosis is the diffusion of—

a. oxygen
b. glucose
c. water
d. carbon dioxide

1. which organelle is the control center of the cell?

a. ribosome
b. nucleus
c. mitochondrion
d. vacuole

1. mitochondria are responsible for—

a. protein synthesis
b. photosynthesis
c. cellular respiration
d. waste removal

1. ribosomes function in—

a. lipid production
b. protein synthesis
c. energy production
d. storage

Explanation:

Question 9

The nucleus contains genetic material, the cell wall provides structure (in plant cells), cytoplasm is the fluid inside the cell, and the cell membrane is selectively permeable, controlling what enters and leaves the cell.

Diffusion is the passive movement of molecules from an area of high concentration to low concentration, without using energy and along the concentration gradient.

Osmosis is a specific type of diffusion that involves the movement of water molecules across a semi - permeable membrane.

Answer:

D. Cell membrane

Question 10