Introduction to Cell Membrane

Fill in the blank: The cell membrane is composed of a bilayer of ________.

• Phospholipids.

• Proteins.

• Carbohydrates.

• Nucleic acids.

In the plasma membrane, proteins float like _______.

• icebergs

• balloons

• boats

• clouds

What holds the plasma membrane together?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Metallic bonds

Proteins in the plasma membrane are referred to as _______ to regulate traffic.

• Gatekeepers

• Transporters

• Channels

• Receptors

Transporter proteins bind a specific substance, change their shape, and move it across the membrane. True or False?

• True

• False

Which type of protein goes entirely through the membrane?

• Transmembrane protein

• Peripheral protein

• Lipid-anchored protein

• Glycoprotein

What role do proteins serve in the plasma membrane?

• They act as channels and transporters for molecules.

• They provide energy for cellular processes.

• They store genetic information.

• They synthesize lipids.

What are the two types of gradients across the membrane?

• Concentration gradient and Electrical gradient

• Chemical gradient and Physical gradient

• Thermal gradient and Pressure gradient

Which of the following is a function of a Linker?

• Allow cell to recognize other similar cells

• Anchor proteins in cell membrane or to other cells

• Provide energy to the cell

• Replicate DNA

In plasma membranes, selective permeability depends on many biological functions and biochemical reactions both within and outside each cell.

• True

• False

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