BIO 1500 FINAL EXAM HOMEWORK
ANSWERS STUDY GUIDE QUESTIONS
AND ANSWERS 100% PASS
What is diffusion? - ✔✔the spontaneous movement of molecules away from areas of
highest density
One area in a cell has a higher density of a certain type of molecule compared to a
neighboring area. This situation describes: - ✔✔a concentration gradient
The highest rates of diffusion are associated with (choose all that are correct!!): - ✔✔-
high temperatures
-large diffusion surface area
-steep concentration gradient
After molecules have moved around until there is no longer a concentration gradient,
how do the molecules behave? - ✔✔they continue moving, but their density remains
relatively even throughout the space
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, How does facilitated transport differ from diffusion? - ✔✔in facilitated transport, the
substance passes through a pore, or tunnel, inside other molecules in the membrane
Which three of the following are types of transport proteins? - ✔✔-aquaporins
-channel proteins
-carrier proteins
What benefit do cells obtain by using facilitated transport instead of simple
(=unfacilitated) diffusion to move material across a membrane? - ✔✔Some molecules
have positive and negative regions (i.e. polarity) that prevent them from moving easily
through the membrane; facilitated transport overcomes this problem
What does it mean if a channel is gated? - ✔✔sometimes the channel allows molecules
to pass through, and sometimes it doesn't
What is the difference (or relationship) between the terms diffusion and osmosis? -
✔✔they both function in the same way, but osmosis refers specifically to the diffusion
of water molecules
Which of the following are the four categories of organic molecules? Note: the question
asks for the 4 categories, not for specific examples of organic molecules, and not for the
building blocks of organic molecules - ✔✔-carbohydrates
-lipids
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ANSWERS STUDY GUIDE QUESTIONS
AND ANSWERS 100% PASS
What is diffusion? - ✔✔the spontaneous movement of molecules away from areas of
highest density
One area in a cell has a higher density of a certain type of molecule compared to a
neighboring area. This situation describes: - ✔✔a concentration gradient
The highest rates of diffusion are associated with (choose all that are correct!!): - ✔✔-
high temperatures
-large diffusion surface area
-steep concentration gradient
After molecules have moved around until there is no longer a concentration gradient,
how do the molecules behave? - ✔✔they continue moving, but their density remains
relatively even throughout the space
100% Pass Guarantee Sophia Bennett, All Rights Reserved © 2025 1
, How does facilitated transport differ from diffusion? - ✔✔in facilitated transport, the
substance passes through a pore, or tunnel, inside other molecules in the membrane
Which three of the following are types of transport proteins? - ✔✔-aquaporins
-channel proteins
-carrier proteins
What benefit do cells obtain by using facilitated transport instead of simple
(=unfacilitated) diffusion to move material across a membrane? - ✔✔Some molecules
have positive and negative regions (i.e. polarity) that prevent them from moving easily
through the membrane; facilitated transport overcomes this problem
What does it mean if a channel is gated? - ✔✔sometimes the channel allows molecules
to pass through, and sometimes it doesn't
What is the difference (or relationship) between the terms diffusion and osmosis? -
✔✔they both function in the same way, but osmosis refers specifically to the diffusion
of water molecules
Which of the following are the four categories of organic molecules? Note: the question
asks for the 4 categories, not for specific examples of organic molecules, and not for the
building blocks of organic molecules - ✔✔-carbohydrates
-lipids
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