Simple and Facilitated Diffusion

Last updated: 14/11/2019

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Question 1 of 18
1. Question
Which of these can cross membranes by simple diffusion?
- Oxygen
- Water
- Glucose
- Amino acids
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Question 2 of 18
2. Question
Which process does not require proteins to cross the membrane?
- Simple diffusion
- Osmosis
- Facilitated diffusion
- Active transport
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Question 3 of 18
3. Question
Which of these will increase the rate of diffusion?
- Higher surface area and difference in concentration
- Higher surface area and thickness of surface
- Higher difference in concentration and thickness of surface
- Lower surface area and difference in concentration
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Question 4 of 18
4. Question
Which is used to move carbon dioxide across a membrane?
- Simple diffusion
- Facilitated diffusion
- Active transport
- Cotransport
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Question 5 of 18
5. Question
Which uses proteins but cannot operate against a concentration gradient.
- Facilitated diffusion
- Simple diffusion
- Active transport
- Cotransport
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Question 6 of 18
6. Question
Which does not affect the rate of diffusion across a membrane?
- Presence of a catalyst
- Surface area
- Thickness of barrier
- Difference in concentration on each side
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Question 7 of 18
7. Question
What is the purpose of villi and microvilli in the mammalian ileum?
- Increases surface area
- Friction slows passage of food, giving more time for nutrient absorption
- Prevents enzymes from being washed rapidly from the gut
- Helps to move food along the gut
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Question 8 of 18
8. Question
In which direction do molecules move by diffusion?
- From high to low concentration
- From low to high concentration
- From low to low concentration
- From high to high concentration
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Question 9 of 18
9. Question
Why is diffusion considered as a ‘passive process’?
- Only kinetic energy of molecules is used, not ATP
- ATP is used alone
- Occurs alone with no other signaling involved
- Requires no form of energy
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Question 10 of 18
10. Question
When is it considered that molecules have reached equilibrium?
- When there is no net diffusion across the membrane
- When all molecules reach one side of the membrane
- When molecules remain in the same place and no more movement occurs
- When molecules leave the sight of diffusion
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Question 11 of 18
11. Question
What types of molecules can pass through membranes via simple diffusion?
- Small, uncharged molecules
- Small, charged molecules
- Large, uncharged molecules
- Large, charged molecules
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Question 12 of 18
12. Question
Why can steroid hormones pass through cell membranes?
- They are lipid soluble
- They are small enough
- They are lipid insoluble
- They bind with the phospholipids
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Question 13 of 18
13. Question
How does temperature affect simple diffusion?
- Rate of diffusion increases
- Rate of diffusion decreases
- Rate of diffusion remains unchanged
- Rate of diffusion becomes zero
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Question 14 of 18
14. Question
How does diffusion distance affect diffusion?
- Thicker the membrane, slower diffusion
- Thinner the membrane, slower diffusion
- Thicker the membrane, faster diffusion
- Thinner the membrane, no diffusion
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Question 15 of 18
15. Question
How does surface area affect diffusion?
- Increased surface area, increased diffusion
- Increased surface area, decreased diffusion
- Decreased surface area, increased diffusion
- Increased surface area, no diffusion
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Question 16 of 18
16. Question
What diffuses more rapidly?
- Smaller molecules
- Larger molecules
- Slower molecules
- Faster molecules
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Question 17 of 18
17. Question
Which of these deceases membrane permeability?
- Cholesterol
- Amino acids
- Phospholipids
- Proteins
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Question 18 of 18
18. Question
How is concentration gradient maintained?
- By molecules being used up in metabolic reactions
- By pumps in the plasma membrane
- By carrier proteins
- By simple diffusion
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