Ch. 7 L. 2 The Plasma Membrane Review

Ch. 7 L. 2 The Plasma Membrane Review

By D Olg

Multiple Choice

Define plasma membrane

• lipid that helps minimize effects of temperature

• only on the outer surface of the plasma membrane and are attached to proteins or lipids; form distinctive cellular markers

• flexible boundary of a cell that separates a cell from its surroundings

• may extend partway into the plasma membrane, cross the membrane entirely, or be loosely attached to its inside or outside face

Multiple Choice

Where can carbohydrates be found when part of a plasma membrane?

• On the outside of the membrane

• On the inside of the membrane

• Embedded part of the way into the membrane

• Embedded the whole way through the membrane

• All of the above

Multiple Choice

Plasma membranes are selectively permeable. This means

• anything can pass in and out

• the membrane regulates the passage of the material in and out of the cell

• glucose cannot enter the cell

• cholesterol cannot enter

Multiple Choice

Where can PROTEINS be found when part of a plasma membrane?

• On the outside of the membrane

• On the inside of the membrane

• Embedded part of the way into the membrane

• Embedded the whole way through the membrane

• All of the above

Multiple Choice

What is the function of cholesterol in a plasma membrane?

• To make the membrane flexible

• To control the effect of temperature changes

• To attract water molecules

• To allow nutrients and other essential molecules into the cell

Multiple Choice

Lipid tails are...

• Nonpolar
• Polar

Multiple Choice

Lipid heads are...

• Polar
• Nonpolar

Multiple Choice

This image is an example of a phospholipid. Which part of a phospholipid is HYDROPHOBIC?

• the phosphate "head"

• the lipid "tails"

Multiple Choice

Which type of biological macromolecule is the main component of the plasma membrane?

• carbohydrate

• lipid

• protein

• nucleic acid

Multiple Choice

Identify cholesterol molecule

• structure a

• structure b

• structure h

• structure i

Multiple Choice

Identify a peripheral protein

• structure a

• strucure b

• structure g

• structure h

Multiple Choice

Which structure is the hydrophilic polar head of the phospholipid molecule?

• F

• D

• C

• A1

Multiple Choice

When looking at the cell membrane, where are the lipid tails located?

• Inner part of the bilayer
• Outer part of the bilayer
• At the end of the bilayer
• Goes through each end of the bilayer

Multiple Choice

When looking at the cell membrane, where are the lipid heads located?

• Floating between bilayer levels
• Outer part of the bilayer
• Inner part of the bilayer
• Located at different parts throughout the bilayer

Multiple Choice

How many layers is the lipid bilayer?

• 1
• 2
• 3
• 4

Multiple Choice

Which structure is the hydrophobic tail of the phospholipid molecule?

• E

• B

• G

• A2

Multiple Choice

Small, nonpolar, hydrophobic molecules such as fatty acids

• easily pass through the membrane's bilayer

• very slowly diffuse through the bilayer

• require transport proteins

• enter through endocytosis

Multiple Choice

The cholesterol associated with membranes

• is attached to proteins and extends into the environment surrounding the cell

• helps stabilize the membrane at body temperature

• is an abnormality resulting from a diet high in cholesterol

• both a and c

Multiple Choice

The purple regions of the image represent:

• phospholipid

• cholesterol

• proteins

• carbohydrates

Multiple Choice

What kinds of molecules pass through a cell membrane most easily?

• ionic

• small and hydrophobic

• large polar

• large and hydrophobic

Multiple Choice

Which of the following allows water to move faster across cell membranes?

• aquaporins

• ATP

• peripheral proteins

• the sodium-potassium pump

Multiple Choice

A major function of glycoproteins and glycolipids in the membane is to

• glue cells together to form tissues

• allow cells to identify each other

• attach membrane to cytoskeleton

• help retain shape

Multiple Choice

The _____ in the plasma membrane is responsible for identifying other cells. 

• proteins
• lipids
• carbohydrates
• cholesterol

Multiple Choice

Which of the following is responsible for getting complex molecules across the cell membrane?

• Lipids
• Carbs
• Proteins
• Nucleic Acids

Multiple Choice

How does cholesterol affect the cell membrane in low temperatures?

• helps it from becoming too rigid
• makes it more viscous
• denatures it
• assures it solidifies

Multiple Choice

Which of the following would likely move through the lipid bilayer most rapidly?

• potassium

• an amino acid

• Carbon dioxide

• glucose

Multiple Select

The fluid mosaic model describes a membrane consisting of

• a phospholipid bilayer with embedded proteins

• 2 layers of phospholipids with proteins in between

• individual proteins and phospholipids that can drift

• both a and c

Multiple Choice

What is the "big idea" of the Fluid Mosaic Model of plasma membranes?

• the plasma membrane creates a specialized FLUID that looks like a MOSAIC.

• the plasma membrane is a MOSAIC.

• the fluid mosaic model is NOT related to the plasma membrane.

• a plasma membrane is a MOSAIC of components that move FREELY and FLUIDLY.

Multiple Choice

Where can PROTEINS be found when part of a plasma membrane?

• On the outside of the membrane

• On the inside of the membrane

• Embedded part of the way into the membrane

• Embedded the whole way through the membrane

• All of the above

Multiple Choice

Looking at the fluid mosaic model, where is extracellular located?

• top of diagram

• below diagram

Multiple Choice

Looking at the fluid mosaic model, where is intracellular located?

• top of diagram

• below diagram

Multiple Choice

What is the function of a selectivly permeable membrane?

• Provides alternative to phospholipid bilayer

• Prevents transport proteins from harming cells

• Controls what enters and leaves the cells

• Blocks all water from entering and leaving the cell

Multiple Choice

What critical function does cholesterol serve in the body?

• Destroys the plasma membrane

• Binds fatty acid tails

• Disrupts homeostasis

• Increases the fluidity of the plasma membrane

Fill in the Blanks