Cell Membrane Structure and Function Review

The arrow points to a component of the membrane that is best described as a

• sugar floating in lipids.

• protein floating in lipids.

• lipid floating in proteins.

• lipid floating in sugars.

Which cellular organelle is represented by the diagram?

• cell wall

• chloroplast

• plasma membrane

• mitochondria

What is the function of the selectively permeable plasma membrane?

• to store chemical and heat energy inside the cell

• to control the movement of substances into and out of the cell

• to control the movement of red blood cells

• to store waste products inside the cell

Which of the following statements about the phospholipid bilayer is correct?

• The heads are hydrophobic and the tails are hydrophilic.

• The heads are hydrophilic and the tails are hydrophobic.

• Both the heads and tails are hydrophobic.

• Both the heads and tails are hydrophilic.

How does this structure help the cell function?

• by acting as the control center for the cell

• by forming a rigid, outer barrier for the cell

• by serving as the site of protein synthesis in the cell

• by regulating the movement of materials into and out of the cell

Tags

NGSS.MS-LS1-2

Which best describes a selectively permeable plasma membrane?

• Only water can pass through the membrane.

• All substances can pass through the membrane.

• Only certain substances can pass through the membrane.

• All substances use carrier proteins to pass through the membrane.

Which molecules form the bilayer of the cell membrane?

• carbohydrates

• cholesterols

• phospholipids

• proteins

Which is true of the phospholipids located in the plasma membrane?

• They have hydrophobic heads and hydrophilic tails.

• They have hydrophobic tails and hydrophilic heads.

• They are composed of glucose molecules.

• They are composed of amino acids.

Which diagram is the best representation of the plasma membrane?

• Diagram 1

• Diagram 2

• Diagram 3

• Diagram 4

Which component of the cell membrane functions to actively transport molecules into the cell?

• carbohydrate

• cytoplasm

• phospholipid

• protein