AP Biology Unit 2

High Surface area to volume ratio allows cells to do what quickly?

• Move materials around inside the cell

• Move materials in and out of the cell 

• Communicate to other cells

• Divide

Tags

NGSS.MS-LS1-2

Microvilli are tiny projections that extend off the cell to increase the Surface Area.  What purpose might that serve? 

• Increased absorption

• Better communication among cells

• Maintain homeostasis 

• Decreased oxygen use

Tags

NGSS.MS-LS1-2

What type of relationship is seen between increased surface area (x axis) & the rate or speed at which things move in and out of the cell (y axis)?

• Constant

• Direct

• Indirect

Which cells are more efficient at obtaining nutrients?

• Small Cells

• Medium Size Cells

• Large Cells

• X-Large Cells

Part of the plasma membrane responsible for cell recognition... 

• C

• E

• B

• D

The function of the plasma membrane is....

• to regulate what enters and leaves the cell.

• fight bacteria and viruses that enter the cell.

• provide rigid support and protection to the cell.

• make sure each cell can move

Tags

NGSS.MS-LS1-2

The compounds in biological membranes that form a barrier to the movement of hydrophilic materials across the membrane are 

• integral membrane proteins

• carbohydrates

• lipids

• peripheral membrane proteins

In biological membranes, the phospholipids are arranged in a _______, with the_______?

• bilayer; fatty acids pointing toward each other

• bilayer; fatty acids facing outward

• single layer; fatty acids facing the interior of the cell

• single layer; phosphorus-containing region facing the interior of the cell

A characteristic of plasma membranes that helps them fuse during vesicle formation and phagocytosis is the

• ratio of one protein molecule for every 25 phospholipid molecules

• capacity of lipids to associate and maintain a bilayer organization

• constant length of the fatty acid chain and the degree of saturation

• ability of phospholipid molecules to flip over and trade places with other phospholipid molecules

Which statement about cholesterol molecules is true?

• They help hold a membrane together.

• They alter the fluidity of the membrane.

• They attach to carbohydrates.

• They disrupt membrane function.