ap classroom lab 1

To model a plant cell, a permeable, nonflexible case is placed around each piece of dialysis tubing. The greatest pressure potential will develop within dialysis tube number

4

The contents of which dialysis tube are initially isotonic to the distilled water in the beaker?

5

A net movement of water into the beaker occurs in which of the following dialysis tubes?

6

Site of transport of materials into and out of the cell

D

If, instead of the bag, a potato slice were placed in the beaker of distilled water, which of the following would be true of the potato slice?

It would gain mass.

If ATP breakdown (hydrolysis) is inhibited, which of the following types of movement across cell membranes is also inhibited?

Passage of a solute against its concentration gradient

Which of the following components of the cell membrane is responsible for active transport?

Protein

Which of the following best describes the condition expected after 24 hours?

The contents of the bag will have the same osmotic concentration as the surrounding solution.

What can be deduced from graph I?

The maximal flow of water through the stem lags behind the maximal rate of transpiration.

From the initial conditions and results described, which of the following is a logical conclusion?

The pores of the bag are larger than the glucose molecules but smaller than the starch molecules.

Which of the following scientific questions is most relevant to the model represented in the figure above?

Which molecular substance is actively transported across the plasma membrane?

Which of the following best represents the amount of starch, water, and glucose in the dialysis bag over the course of the investigation?

b

Simple diffusion and facilitated diffusion are related in that both

depend on a concentration gradient

When a substance moves across the plasma membrane along a concentration gradient at a rate faster than would be expected by simple diffusion alone but without the expenditure of metabolic energy, the process is best described as

facilitated diffusion

All of the following changes would be likely to decrease the rate of transpiration at 8 A.M. EXCEPT

increasing the water potential of the soil

Water enters and leaves the plant cells primarily by

osmosis