What it means to "go with the concentration gradient." 2:20
Facilitated diffusion 2:38
Active transport 4:53
Endocytosis 5:36
Exocytosis 6:36
Question 1
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Question 2
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Question 3
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Question 4
4.
Draw a picture of a phospholipid and label the regions that are: polar, and nonpolar.
Question 5
5.
Question 6
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Question 7
7.
Question 8
8.
Question 9
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Question 10
10.
Question 11
11.
Question 12
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Question 13
13.
The other type of transport is ____________________, which requires energy, because it moves particles against the concentration gradient.
Question 14
14.
Question 15
15.
Question 16
16.
Question 17
17.
Question 18
18.
Question 19
19.
Question 20
20.
Question 21
21.
Most eukaryotes have _______________________ organelles.
membrane-bound
rigid
ATP in
By regulating what goes in and out of the cell, the cell membrane helps to regulate...
cell division
digestion
immune response
homeostasis
The major part of the cell membrane is/are the
phospholipid bilayer
receptors
transport proteins
Which parts of the phospholipid make the inner layer or region of the bilayer?
the polar head
the nonpolar tails
Very small nonpolar molecules such as gases like carbon dioxide, are able to go through the cell membrane in a process called
Osmosis
Simple diffusion
Active transport
Simple diffusion is also classified as
Passive transport, because it does not require energy to occur.
Active transport, because it requires energy in order to occur.
In passive transport, particles move through the cell membrane with the concentration gradient (or moves with the flow), which means that
particles move from an area of low concentration to high concentration.
particles move from an area of high concentration to low concentration.
Sometimes particles need assistance crossing the phospholipid bilayer, because they are _________________ and need the help of a transport protein.
polar
too small
nonpolar
too large
When help is needed by transport protein, the transport proteins may ... in a process called facilitated diffusion.
open and close based on a signal or stimulus
change chemical composition by adding more proteins to itself
act as channels to allow particles to pass through the cell membrane
change shape to transport particles
Facilitated diffusion is also considered passive transport, because:
- it does not require energy
- it moves particles with the concentration gradient
True
False
Give three examples of facilitated diffusion or passive transport.
Charged ions moving through protein channels
Glucose moving through transport proteins
Exocytosis to expel waste out of an organelle
Water moving through aquaporins
ATP, also known as _______________________, contains a large amount of energy that is released when a phosphate bond is broken.
adenine triphosphate
adenosine triphosphate
adenosine tripentate
The sodium-potassium pump is an example of
passive transport
simple diffusion
facilitated diffusion
Sometime very large particles like polysaccharides are needed by a cell and are taken in by a cell through a process called endocytosis, which is requires
cells absorbing other cells.
fusing with particles being transported.
Endocytosis is a general term for the following
chrondocytosis
pinocytosis
phagocytosis
receptor-mediated endocytosis
The process in #16 is
receptor-mediated endocytosis
pinocytosis
phagocytosis
Moving extracellular fluid from outside a cell to inside a cell is called
pinocytosis
receptor-mediated endocytosis
phagocytosis
Low density lipoproteins (LDL cholesterol) require receptors in order to be transported into a cell. This is an example of
phagocytosis
receptor-mediated endocytosis
pinocytosis
Exocytosis is can be used to
create more cell membrane
remove cell waste
make valuable cellular products available to other part of the cell