Unit 2 AP Biology

Which type of membrane protein would likely be most easily removed in a laboratory experiment?

• Integral membrane proteins

• Channel proteins

• Peripheral membrane proteins

• Transmembrane proteins

The LDL receptor is an integral membrane protein that crosses the plasma membrane, with portions of the protein extending both outside and into the interior of the cell. The amino acid side chains (R groups) in the region of the protein that crosses the membrane are most likely

• charged

• hydrophilic

• hydrophobic

• carbohydrates

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

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

• the phosphate "head"

• the lipid "tails"

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

• the phosphate "head"

• the lipid "tails"

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

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

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.

Diffusion is the movement of molecules from

• an area of equilibrium to an area of high concentration.

• an area of low concentration to an area of high concentration.

• an area of high concentration to an area of high concentration.

• an area of high concentration to an area of low concentration.

Tags

NGSS.HS-PS3-2

The movement of water through a semi-permeable membrane is called ___________.

• active transport

• respiration

• osmosis

• diffusion