Phospholipid Bilayer and Transport

Identify the part of the membrane identified as A.

• carbohydrate

• cholesterol

• protein

• phospholipid

What molecule is pictured?

• Integral Protein

• Carbohydrate chain

• Phospholipid

How does a cell maintain homeostasis?

• Regulates what enters and leaves the cell

• Flexibility

• Protective barrier

• Structure and support

Tags

NGSS.HS-LS1-3

Which is true about active transport?

• It requires energy

• it does not require energy

• It moves substances down the concentration gradient

• it moves material from high to low concentration

A ____ contains polar and nonpolar ends, forming the plasma membrane.

• microtubule

• transport protein

• cytoskeleton

• phospholipid bilayer

Proteins built into the cell membrane which assist with the movement of materials are called:

• receptor proteins

• transport proteins

• marker proteins

• channel proteins

Molecules that are too large to be moved through the cell membrane can be transported OUT OF the cell by

• osmosis

• exocytosis

• endocytosis

• diffusion

How is the plasma membrane of a cell organized?

• one layer of phospholipids, through which proteins freely move

• one layer of phospholipids, which are laid out end-to-end, with a hydrophobic tail touching a hydrophilic head

• two layers of phospholipids, each of which has its hydrophilic side turned inward

• two layers of phospholipids, with their polar hydrophilic heads facing away from each other

What characteristic of the plasma membrane is illustrated in this drawing?

• selective permeability

• phospholipid bilayer

• fluid mosaic construction

• impermeability to water

Which movement of substances through a cell membrane against a concentration gradient requires energy?

• osmosis

• diffusion

• active transport

• facilitated diffusion