Cell Membrane and Homeostasis

What is the function of the cell membrane?

• To allow everything to enter the cell

• To maintain homeostasis

• To keep out dangerous things

• To control the cell contents

Tags

NGSS.MS-LS1-2

What does it mean for the cell membrane to be semipermeable?

• It allows all molecules to pass through

• It allows only water to pass through

• It allows only some molecules to pass through

• It allows no molecules to pass through

Why is it important for the cell to maintain homeostasis?

• To allow the cell to survive in different environments

• To keep the temperature of the cell constant

• To control what molecules enter and leave the cell

• To protect the cell from dangerous things

Tags

NGSS.HS-LS1-3

What is the composition of the cell membrane?

• A single layer of phospholipids

• A double layer of phospholipids

• A layer of proteins

• A layer of carbohydrates

What is the function of phospholipids in the cell membrane?

• To control what molecules enter and leave the cell

• To maintain homeostasis

• To form the outside barrier of the cell

• To allow proteins to float to areas where they are needed

Why do the hydrophilic heads of phospholipids face the inside and outside of the cell?

• Because they want to be near water

• Because they want to avoid water

• Because they need to interact with proteins

• Because they need to interact with other cells

Why do the hydrophobic tails of phospholipids face each other in the middle of the cell membrane?

• Because they want to be near water

• Because they want to avoid water

• Because they need to interact with proteins

• Because they need to interact with other cells

What is the fluid nature of the cell membrane important for?

• Maintaining homeostasis

• Allowing proteins to float to areas where they are needed

• Controlling what molecules enter and leave the cell

• Protecting the cell from dangerous things

Tags

NGSS.HS-LS1-3

Which molecules can pass freely through the cell membrane?

• All molecules

• Large molecules

• Oxygen and carbon dioxide

• Water molecules

What do large molecules need to get across the cell membrane?

• Transport proteins

• Phospholipids

• Water molecules

• Oxygen and carbon dioxide