Question

question 11
the structure composed primarily of phospholipids that functions to control the movements of substances in and out of the cell.
a cell wall
b plasma membrane
c cyoskeleton
d nuclear envelope
question 12
the membranous organelle that has ribosomes on the surface and function in storing proteins.
a nucleus
b chloroplast
c mitochondria
d golgi apparatus
e rough endoplasmic reticulum
f smooth endoplasmic reticulum
g ribosome

Explanation:

Question 11

• Option A: Cell wall is mainly for structure/support (in plants, fungi, etc.), not primary phospholipid or main substance control.
• Option B: Plasma membrane (cell membrane) is a phospholipid bilayer that regulates substance entry/exit.
• Option C: Cytoskeleton is for cell shape/movement, not phospholipid - based or substance control.
• Option D: Nuclear envelope surrounds nucleus, not for overall cell substance control.

• Option A: Nucleus stores genetic material, no ribosomes on surface for protein storage.
• Option B: Chloroplast does photosynthesis, not protein storage.
• Option C: Mitochondria is for energy (ATP), no ribosomes on surface for protein storage.
• Option D: Golgi apparatus modifies/sorts proteins, no ribosomes on surface.
• Option E: Rough endoplasmic reticulum (RER) has ribosomes on surface and is involved in protein synthesis/storage.
• Option F: Smooth endoplasmic reticulum has no ribosomes, involved in lipid synthesis.
• Option G: Ribosome is for protein synthesis, not a membranous organelle with storage function.

Answer:

B. Plasma membrane

Question 12