Cell Boundaries

the act of allowing some substances to pass freely across a membrane while not allowing others

• permeable

• non-permeable

• selectively permeable

• open

regulates what enters and leaves the cell

• cell wall

• cell membrane

• exoskeleton

• endoskeleton

Selectively permeable membrane that surrounds the cell

• cell membrane

• cell wall

• cell skin

• endoskeleton

Tags

NGSS.MS-LS1-2

strong supporting layer on the outside of the cell membrane

• cell membrane

• cell wall

• cell skin

• exoskeleton

Which of the following statements accurately describes the phospholipid bilayer?

• • It is composed of two layers of phospholipids arranged to allow the membrane to exist in a watery environment.

• it consists of a single layer of phospholipids.

• It consists of proteins only, without any lipid component

• It is composed of cholesterol only, without any protein component.

A property of cellular membranes that only allows certain molecules to enter or exit the cell. This is important for the cell to maintain its internal order irrespective of the changes to the environment

• selective permeability

• hydrophilic

• hydrophobic

• selective durability

Polar heads face ​ (a)   the cell and they are ​ (b)   , while nonpolar tails face ​ (c)   the cell which are ​ (d)  

• outside

• hydrophilic

• inside

• hydrophobic

Tags

NGSS.HS-LS2-3

____________________ move substances and wastes through the membrane.

• Cholesterol

• Transport proteins

• Carbohydrates

• Transformers

What is the function of cholesterol in a plasma membrane? (2 choices)

• To make the membrane flexible

• To control the effect of temperature changes

• To attract water molecules

• To allow nutrients and other essential molecules into the cell

Which structure provides a rigid boundary to plant cells?

• Cell membrane

• Cell wall

• Cytoplasm

• Nucleus