BIOL-1230 Chapter 5 Quiz

All of the following are functions of the cell membrane EXCEPT

• transmitting signals

• participating in energy transfer

• being freely permeable to all substances

• regulating the passage of materials

• participating in chemical reactions

Tags

NGSS.HS-LS2-3

In a lipid bilayer,_______________ fatty acid tails face each other within the bilayer and form a region that excludes water.

What is meant by the term "fluid mosaic model"?

• It is the diffusion of lipid-soluble substances through the lipid bilayer.

• It is the movement of lipids and integral proteins within the lipid bilayer.

• It is the solubility of water in the membrane.

• It is the method of substance transport across the membrane.

• It is the movement of surface proteins through the membrane.

Facilitated diffusion

• moves molecules against a gradient

• does not occur in prokaryotes

• requires use of ATP

• involves protein channels

• moves substances into and out of cells

Active transport

• moves molecules against a gradient

• does not occur in prokaryotes

• requires use of ATP

• involves protein channels

• moves substances into and out of cells

A molecule is considered amphipathic when it

• prevents free passage substances

• is in a membrane

• has hydrophobic and hydrophilic regions

• is a lipid

• is embedded in a bilipid layer

If membranes were not fluid and dynamic, which of the following might still occur normally?

• active transport

• facilitated diffusion

• simple diffusion

• endo- and exocytosis

• osmosis

Membrane fusion enables

• diversity of proteins

• exocytosis

• endocytosis

• fusion of vesicles and plasma membrane

• formation of Golgi bodies

Cell walls

• are large plasma membranes

• occur in plant cells

• are more rigid than membranes

• are fluid

• contain desmosomes

Red blood cells are placed in three beakers containing the following solutions: beaker A, distilled water; beaker B, isotonic solution; beaker C, 13% salt solution. Use this information to answer questions 7-9.

The cells in beaker C

• shriveled

• swelled

• plasmolyzed

• were unaffected

• probably eventually burst

Tags

NGSS.HS-LS1-3