23 Plasma Membrane and Cell Transport

Imagine you are a scientist studying cell biology. What would you say is the main function of the plasma membrane in a cell?

• It maintains the cell's shape and structure.

• It regulates the movement of substances in and out of the cell.

• It produces energy for the cell.

• It stores the cell's genetic information.

Tags

NGSS.MS-LS1-2

You are a scientist studying cell structures. You are specifically looking at the plasma membrane. Can you identify the two main components of this structure?

• nucleic acids and lipids

• amino acids and sugars

• phospholipids and proteins

• cholesterol and carbohydrates

What is the structure of the plasma membrane known as?

• phospholipid bilayer

• carbohydrate trilayer

• protein bilayer

• lipid monolayer

What is the difference between passive and active transport?

• Passive transport does not require energy, while active transport requires energy.

• Passive transport is faster than active transport in terms of the rate of molecule movement.

• Passive transport involves the movement of molecules from an area of high concentration to an area of low concentration, while active transport involves the movement of molecules from an area of low concentration to an area of high concentration.

• Passive transport occurs across a concentration gradient, while active transport occurs against a concentration gradient.

Give an example of passive transport.

• Osmosis

• Active transport

• Endocytosis

• Diffusion

What is facilitated diffusion?

• A typle of passive transport

• A type of endocytosis.

• A type of osmosis.

• A type of active transport.

How does facilitated diffusion differ from simple diffusion?

• Facilitated diffusion occurs across a concentration gradient, while simple diffusion does not.

• Facilitated diffusion is an active process, while simple diffusion is passive.

• Facilitated diffusion requires transport proteins, while simple diffusion does not.

• Facilitated diffusion is faster than simple diffusion.

Explain the process of endocytosis.

• Endocytosis is the process by which cells release substances into the external environment.

• Endocytosis is the process by which cells divide and multiply.

• Endocytosis is the process by which cells communicate with each other.

• Endocytosis is the process by which cells take in substances from the external environment by engulfing them with their cell membrane.

Identify the correct regions of a phospholipid

c

d

Phosphate head

Carbohydrates tails

Fatty Acid (lipid) tails

Protein head

Identify the hydrophobic / hydrophilic reigon of this phospholipid

d

c

Hydrological

Hydrocephalus

Hydrophilic (attracted to water)

Hydrophobic (Repelled by water)