Cell Membrane Structure and Function

Molecules diffuse

• toward areas of lower concentration

• only into cells from outside

• only out of cells from inside

• toward areas of higher concentration

Tags

NGSS.HS-PS1-5

Cell membranes are made up of:

• phospholipids

• amino acids

• proteins

• both phosopholipids and proteins

Which part of the phospholipid is polar?

• fatty acid tails

• phosphate head

• both fatty acid tails & phosphate head

• neither fatty acid tails nor phosphate head

Which of the following will easily pass through the membrane via simple diffusion?

• small, polar ions

• small, non-polar, charged ions

• large, polar, covalent gasses

• small, polar, covalent gasses

G is pointing to:

• lipid bilayer

• transport protein

• glycolipid

• carbohydrate chain

Which letter is pointing to a hydrophillic portion of the cell membrane?

• J

• C

• E

• D

Cell membrane's property that allows some substances to cross & prevents others from crossing:

• hydrophobic

• hydrophillic

• glycoprotein

• selective permeability

A protein linked to a sugar or polysaccharide; used as receptor molecules on the surface of cells for communication purposes

• transport protein

• glycolipid

• glycoprotein

• cytoplasm

A protein that plays a role in the active or passive movement of specific substances through cell membrane

• transport protein

• cytoplasm

• glycolipid

• glycoprotein

Which of the following is a true statement?

• Cells are small because it allows a faster rate of chemical exchange.

• Cells are small because it allows a slower rate of chemical exchange.

• Cells are large because it allows a faster rate of chemical exchange.

• Cells are large because it allows a slower rate of chemical exchange.