Cell Membrane

Which of the following best describes the cell membrane?

• consistently impermeable

• fluid mosaic

• hydrophobic phospholipid

• the powerhouse of the cell

Which part of a phospholipid is on the outer border of the cell membrane?

• fatty acid tail

• phosphate head

• hydrophobic phosphate

• fatty acid head

Which letter shows a complete phospholipid?

• B

• C

• D

• E

Which best describes what is shown at letter B?

• complete phospholipids

• hydrophilic phosphate heads

• hydrophobic fatty acid tails

• transport proteins

Letter E shows

• phopholipids

• carbohydrates

• cholesterol

• proteins

Why are the heads of the phospholipids facing out?

• they are hydrophobic and do not want to touch the cell fluid

• they are hydrophilic and are attracted the fluid of the cell

• they are intracellular receptors

• they contain carbohydrate chains

Proteins in the cell membrane may be

• intracellular receptors

• membrane receptors

• hydrophobic fatty acids

• impermeable

Cell membranes

• control what goes in and out of the cell

• contain genetic information for the cell

• are the power house of the cell

• modify proteins

Because some things can pass through the cell membrane while other things cannot, we refer to the cell membrane as

• fluid mosaic

• the powerhouse of the cell

• the transportation highway

• selectively permeable

The cell membrane is composed of a

• mitochondrial composite

• phospholipid bilayer

• hydrophilic plasma

• mosaic organelle system