Cell Structure and Function Review

Which of the following is NOT a function of the cell membrane?

• Protection from the external environment

• regulate what enters and exits the cells

• generate energy for life processes

• help recognize and communicate with other cells

Tags

NGSS.MS-LS1-2

This is an image of a phospholipid,  the primary component of the cell membrane.  The letter "a" is indicating the head of the phospholipid which makes up the external region of the membrane.  Why does the phospholipid head turn toward the outer region of the membrane?

• the head is hydrophobic, water hating

• the head is hydrophilic, water loving

• the head is non-polar

Tags

NGSS.MS-LS1-2

Because internal region of the cell membrane is ___________________________, polar substances cannot pass through without the help of ____________________.

• nonpolar; glycolipids

• hydrophilic; glycoproteins

• nonpolar; channel proteins

• hydrophilic; channel proteins

Tags

NGSS.MS-LS1-2

#2

b

glycoprotein (carbohydrate)

channel protein

cholesterol

phospholipid bilayer

Tags

NGSS.MS-LS1-2

#4

a

cholesterol

channel protein

phospholipid bilayer

carbohydrate

Tags

NGSS.MS-LS1-2

#3

d

channel protein

cholesterol

carbohydrate

phospholipid bilayer

Tags

NGSS.MS-LS1-2

NGSS.MS-PS1-1

Which of the following best describes why the "Fluid Mosaic Model" is used to describe the plasma/ cell membrane?

• the membrane and its components are not stationary

• phospholipids can slide past each other

• The cell membrane is flexible and made of many different parts

• all of the characteristics above are correct

Tags

NGSS.MS-LS1-2

Protein pumps, endocytosis, and exocytosis are examples of active transport.

• True

• False

Passive transport requires the use of ATP to carry molecules from low to high concentration.

• True

• False

What type of membrane transport is this illustrating?

• simple diffusion of a nonpolar molecule

• active transport of a polar molecule

• facilitated diffusion of a polar molecule

• osmosis

Tags

NGSS.MS-LS1-2