Question

question 7 (1 point)
describe facilitated diffusion. what are some characteristics of this type of cell transport?
movement of water only, through special channels called secret passages
active process requiring energy, moves molecules against the concentration gradient.
passive process; uses transport proteins, moves molecules along the concentration gradient
endocytosis, engulfing large particles into the cell.
question 8 (1 point)
what is the function of a selectively permeable membrane?
blocks all water from entering cell
controls what enters and leaves cell
prevents transport proteins from harming cell
provides alternative to phospholipid bilayer

Explanation:

• Question 7: Facilitated diffusion is a passive process (does not require energy like ATP). It uses transport proteins (channel or carrier proteins) to move molecules (not just water) along the concentration gradient (from high to low concentration). Option a is wrong as it mentions only water and “secret passages” which is not a scientific term. Option b is wrong as it is not an active process. Option d is about endocytosis which is a different process (engulfing large particles).
• Question 8: A selectively permeable membrane controls what enters and leaves the cell. Option a is wrong as cells need water and it does not block all water. Option c is wrong as transport proteins are often part of the membrane's function in transport. Option d is wrong as the selectively permeable membrane is often the phospholipid bilayer with associated proteins (not an alternative to it).

Answer:

Question 7: C. passive process; uses transport proteins, moves molecules along the concentration gradient
Question 8: B. controls what enters and leaves cell