Cell membrane is a thin line.it controls the movement of materials into and out of the cell. it is partially permeable,that is,it allows only certain materials to pass through.
Answer:
D
Explanation:
When a substance moves from low to high concentration it is moving against its concentration gradient, which requires more energy.
A. It depends on where it is moving, not the substance
OB. This is describing diffusion
OC. Does not require energy, it is passive transport through a semi-permeable membrane
84.798 is the mass number
Enzymes is a substance produced by living organisms thats acts as a catalyst to bring about a specific biochemical reaction. <span />
4 and F, 9and E r 2 of the answers
