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3.4 Bio

3.4 Bio

Assessment

Presentation

Science

KG

Practice Problem

Hard

Created by

Alejandra Mendoza

Used 5+ times

FREE Resource

7 Slides • 6 Questions

1

​IV. Diffusion and Osmosis (3.4)

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A. Passive transport- allows cell to move materials across cell membrane without using energy

1. Diffusion- Movement of materials (fluid or gas) from region of high concentration to region of low concentration

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​a. Concentration gradient- used to describe areas of high and low concentration.

b. When movement makes concentration equal- reaches dynamic equilibrium (Molecules still continue to move- dynamic)

c. Diffusion plays important role in movement of carbon dioxide and oxygen molecules

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Multiple Choice

What plays an important role in movement?

1

Diffusion

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Oxygen

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Concentration Gradient

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Osmosis

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Multiple Choice

What allows materials to cross the cell membrane without using energy?

1

Passive transport

2

Photosynthesis

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Enzymes

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​2. Osmosis- Diffusion of water molecules

a. Three terms used to describe the amount of dissolved particles in cell compared to   amount of water (terms are comparisons)

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1). Isotonic- same concentration of dissolved materials (water moves in and out at equal rate)

2). Hypertonic- solution has higher concentration of dissolved materials (Water concentration higher in cell than outside- water moves out of cell

​3). Hypotonic- Solution has lower   concentration of dissolved materials (water moves into the cell) 

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Multiple Choice

Which of these have a higher solution of dissolved materials?

1

Isotonic

2

Hypertonic

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Hypotonic

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Multiple Choice

Which of these have the same solution of dissolved materials?

1

Isotonic

2

Hypertonic

3

Hypotonic

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Multiple Choice

Which of these have the lower solution of dissolved materials?

1

Isotonic

2

Hypertonic

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Hypotonic

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​B. Facilitated diffusion- larger molecules can still diffuse through openings formed by transport proteins

1. Still form of passive transport

  2. Many types of transport proteins- most allow only certain molecules to travel into cell

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Multiple Choice

Larger molecules can still diffuse through openings formed by ___ ?

1

Active Transport

2

Passive Transport

​IV. Diffusion and Osmosis (3.4)

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