
Plasma Membrane and Cell Signaling

Quiz
•
Science
•
12th Grade
•
Medium
Taylor Hanley
Used 12+ times
FREE Resource
19 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
Please write a paragraph connecting the following vocabulary terms together: Membrane, Aquaporins, Exocytosis, and Active Transport.
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Answer explanation
A membrane is a layer that separates 2 compartments or environments from each other. In cells these are specifically plasma membranes or phospholipid bilayers. In order for water to move through the membrane, a special channel protein, called an aquaporin, is used. The water flows from high to low concentration, which means it is passive transport. This is different than when molecules need to move opposite of their concentration gradient across the membrane. That requires active transport because it needs energy in the form of ATP to move against the concentration gradient. Another type of active transport is Exocytosis. In exocytosis, molecules are moved out of the cell with a transport vesicle that merges with the cell membrane. This is different than the aquaporins because it moves many molecules at one time and requires energy.
2.
OPEN ENDED QUESTION
3 mins • 1 pt
Explain what a selectively permeable membrane is and what features of the cell membrane allows it to be selectively permeable.
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Answer explanation
A membrane that is selectively permeable allows some substances to cross the membrane but not others. This allows the cell to regulate what flows in and out of the cell. Most substances that can flow through phospholipid bilayer of the membrane are small and non-polar. Larger and polar molecules need other features of the membrane to cross through facilitated diffusion. These features are transport proteins, for which there are a few different kinds. Channel proteins are hydrophilic passages that allow for the polar molecules to flow through with their concentration gradient. One example of a channel protein is the aquaporin, which allows for water to pass in and out of the cell. Carrier proteins work with specific molecules and change shape to shuttle them across the membrane. Transport proteins can also be used to move molecules against their concentration gradient, but this requires energy and is referred to as active transport.
3.
OPEN ENDED QUESTION
3 mins • 1 pt
Compare and contrast active and passive transport.
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Answer explanation
Active and passive transport are similar in many ways. Both types of transport move substances across the plasma membrane of the cell and can involve transport proteins. Active and passive transport are different because active transport requires energy in the form of ATP to move the substances and passive does not. Additionally, passive transport moves molecules with its concentration gradient and active moves against.
4.
MATCH QUESTION
1 min • 1 pt
Match the vocab word with its definition
some substances cross and others not
Integral Proteins
proteins that penetrate lipid bilayer
Amphipathic
bound loosely to surface of membrane
Transmembrane proteins
molecules both hydrophobic & philic part
Selective Permeability
spans the membrane
Peripheral proteins
5.
MATCH QUESTION
1 min • 1 pt
Match vocab words to their definitions
transport proteins move with con. grad.
Aquaporins
molecules spread out evenly in space
Carrier proteins
facilitates water passage
Channel proteins
shuttle across by changing shape
Diffusion
a tunnel substances can use to cross PM
Facilitated diffusion
6.
MATCH QUESTION
1 min • 1 pt
Match the following vocabulary words with the definition
from high to low concentration
Passive transport
molecules move both directions equally
Dynamic Equililbrium
diffusion of water
Concentration Gradient
movement with conc. grad. and no energy
Osmosis
7.
MATCH QUESTION
1 min • 1 pt
Match the following vocab words with the definition
concentration greater out than inside
Hypotonic
concentration same in and out
Hypertonic
control of concentration and water
Isotonic
solution causes cell to gain/loose water
Osmoregulation
Concentration is greater inside than out
Tonicity
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