Question

question 4 (mandatory) (0.5 points)
according to the image in slide 3 of your lab exercise (two dyes migrate across an agar gel), what is the relationship between molecular weight and rate of diffusion?
a) lower molecular weight travels faster by diffusion
b) lower molecular weight travels slower by diffusion
c) higher molecular weight travels faster by diffusion
d) molecular weight doesnt affect rate of diffusion

question 5 (mandatory) (0.5 points)
a solution surrounding a cell is __ if it contains fewer nonpenetrating solute particles than the interior of the cell; thus water moves __ the cell by osmosis.
a) hypotonic, out of
b) hypertonic, out of
c) hypotonic, into
d) hypertonic, into

Explanation:

Question 4

In diffusion, smaller (lower molecular weight) molecules generally move faster as they can navigate through the medium (like agar gel) more easily. Larger (higher molecular weight) molecules have more difficulty, so lower molecular weight molecules travel faster, meaning higher molecular weight travels slower. So the correct relationship is lower molecular weight travels faster, higher slower, so option B (stating lower travels slower is incorrect? Wait, no—wait, the options: A is lower travels faster, B is lower travels slower. Wait, no, my mistake. Wait, diffusion rate: smaller molecules (lower MW) diffuse faster. So if a molecule has lower MW, it travels faster. So the question is "what is the relationship between molecular weight and rate of diffusion?". So lower MW → faster rate. So option B says "Lower molecular weight travels slower by diffusion"—no, that's wrong. Wait, maybe I misread. Wait the options:

A) Lower molecular weight travels faster by diffusion

B) Lower molecular weight travels slower by diffusion

C) Higher molecular weight travels faster by diffusion

D) Molecular weight doesn't affect rate of diffusion

So the correct answer is A? Wait, maybe the original image had a typo, but based on diffusion principles: smaller (lower MW) molecules diffuse faster. So the correct answer should be A. But maybe I made a mistake. Wait, no—diffusion rate is inversely related to molecular weight (for same shape, etc.). So lower MW → faster diffusion. So the correct option is A. Wait, but the user's image: let me recheck.

Wait the user's Question 4: "According to the image in slide 3 of your lab exercise (two dyes migrate across an agar gel), what is the relationship between molecular weight and rate of diffusion?

A) Lower molecular weight travels faster by diffusion

B) Lower molecular weight travels slower by diffusion

C) Higher molecular weight travels faster by diffusion

D) Molecular weight doesn't affect rate of diffusion"

So based on diffusion: smaller molecules (lower MW) move faster. So the answer is A. But maybe the lab exercise's image showed that? Wait, maybe I messed up. Wait, no—for example, in agar gel, a smaller dye (lower MW) will diffuse faster than a larger one (higher MW). So the correct answer is A.

Question 5

A hypotonic solution has fewer nonpenetrating solute particles than the cell's interior. In osmosis, water moves from an area of lower solute concentration (hypotonic solution) to higher solute concentration (inside the cell), so water moves into the cell. So the solution is hypotonic, and water moves into the cell. So option C: hypotonic, into.

Answer:

B) Lower molecular weight travels slower by diffusion