when molecules move from a high concentration to a low.

What does selectively-permeable mean?

The cell controls what passes in and out of the cell

The cell lets only large substances through

... is limited to only things leaving the cell

... is limited to only things entering the cell

Active transport requires energy because...

The cell is moving something against a concentration gradient

The cell is moving something with a concentration gradient

What does the blue black coloring inside the artificial cell indicate?

starch indicator passed through dialysis membrane

glucose indicator passed through dialysis membrane

glucose had a chemical reaction with starch

someone spilled ink in their "cell"

Cell membranes are said to be selectively permeable. Which statement best explains what selectively permeable means?

The cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.

The cell membrane prevents any harmful substance from entering the cell.

The cell membrane allows only large molecules to diffuse into the cell.

The cell membrane has pores that let only water and glucose into the cell and carbon dioxide out.

Base your answer to the question on the diagram below and on your knowledge of biology. The diagram represents two solutions, A and B , separated by a selectively permeable membrane. Which statement best describes the outcome after 20 minutes?

Solution A will contain approximately the same number of glucose molecules as solution B .

Solution A will contain all of the water molecules.

Solution B will remain unchanged.

Solution B will lose all of the glucose molecules to solution A .

The diagram below represents a cell in water. Formulas of molecules that can move freely across the cell membrane are shown. Some molecules are located inside the cell and others are in the water outside the cell. Based on the distribution of these molecules, what would most likely happen after a period of time?

The concentration of O 2 will increase inside the cell.

The concentration of CO 2 will remain the same inside the cell.

The concentration of O 2 will remain the same outside the cell.

The concentration of CO 2 will decrease outside the cell.

A substance is most likely to diffuse into a cell when

the concentration of the substance is greater outside the cell than inside

it is a large organic food molecule such as protein or starch

it is enclosed in an organelle such as a vacuole

the pH of the substance is greater than the pH of the cellListen

The diagram below shows the relative concentration of molecules inside and outside of a cell. Which statement best describes the general direction of diffusion across the membrane of this cell?

Carbon dioxide would diffuse out of the cell.

Glucose would diffuse into the cell.

Protein would diffuse out of the cell.

Oxygen would diffuse into the cell.

AIS Diffusion/AT

Biology

9th - 10th Grade

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

When particles move from areas of high concentration to areas less concentrated, this has taken place.

diffusion

mitosis

endocytosis

photosynthesis

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What process occurs when WATER diffuses across a membrane?

endocytosis

mitosis

osmosis

nuclear fission

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which diagram best shows the end result of diffusion?

The picture is an example of _________________.

isotonic

diffusion

osmosis

active transport

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

When both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of ___________.

osmosis

equilibrium

diffusion

hypertonic

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Osmosis is the movement of _____ across a membrane.

food

energy

oxygen

water

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Permeable means

things can pass through

the concentration levels are different

it is permanent

things are stuck

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AIS Diffusion/AT

When particles move from areas of high concentration to areas less concentrated, this has taken place.

What process occurs when WATER diffuses across a membrane?

Which diagram best shows the end result of diffusion?

The picture is an example of _________________.

When both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of ___________.

Osmosis is the movement of _____ across a membrane.

Permeable means

A person should never drink salty water because their cells would

Passive transport requires no

The movement of molecules against a concentration gradient

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