Plasma Membrane and Cell Signaling

Plasma Membrane and Cell Signaling

12th Grade

19 Qs

quiz-placeholder

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Plasma Membrane and Cell Signaling

Plasma Membrane and Cell Signaling

Assessment

Quiz

Science

12th Grade

Medium

Created by

Taylor Hanley

Used 12+ times

FREE Resource

19 questions

Show all answers

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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