Untitled Lesson

Multiple Choice

Which of the following is an example of active transport in cellular movement?

• Simple diffusion

• Facilitated diffusion

• Osmosis

• Na/K pump

Multiple Choice

Which of the following is a primary function of the cell membrane?

• It forms a boundary between the inside and outside of the cell.

• It produces energy for the cell.

• It stores genetic information.

• It synthesizes proteins.

Multiple Select

Which of the following molecules are components of the cell membrane according to the Fluid Mosaic Model?

• Proteins

• Carbohydrates

• Cholesterol

• Nucleic acids

Fill in the Blanks

The double layer of phospholipids that make up the cell membrane is called the

bilayer.

Multiple Choice

Which part of a phospholipid is hydrophilic?

• Phosphate head

• Fatty acid tail

• Both head and tail

• Neither head nor tail

Multiple Choice

Why is the phospholipid bilayer impermeable to polar molecules?

• Because the hydrophobic tails repel polar molecules.

• Because the hydrophilic heads attract polar molecules.

• Because polar molecules are too large.

• Because the bilayer is too thin.

Multiple Choice

Which of the following is NOT a type of lipid listed in the first image?

• Fatty acids

• Glycoproteins

• Steroids

• Phospholipids

Multiple Select

Which of the following components are found in the cell membrane structure as shown in the images?

• Phospholipid bilayer

• Cholesterol

• Glycoprotein

• Nucleus

Multiple Choice

Which of the following is NOT a function of membrane proteins as illustrated in the fifth image?

• Structural support

• Recognition

• DNA replication

• Transport

Fill in the Blanks

Cholesterol helps to keep the cell membrane

at different temperatures.

Multiple Choice

What is one main function of cholesterol in the cell membrane?

• Acts as an enzyme

• Stabilizes the membrane

• Anchors the cell in place

• Facilitates cell recognition

Multiple Choice

Which of the following best describes the function of carbohydrates attached to lipids and proteins in the cell membrane?

• They serve as cell markers for identification.

• They provide structural support to the membrane.

• They transport ions across the membrane.

• They synthesize proteins.

Multiple Select

Which of the following are components of the cell membrane?

• Phospholipids

• Integral proteins

• Carbohydrate portion of glycoprotein

• Nucleus

Multiple Choice

What is the main characteristic of a selectively permeable membrane?

• It allows only water to pass through.

• It allows all substances to pass through freely.

• It allows some substances to pass through while blocking others.

• It blocks all substances from passing through.

Fill in the Blanks

The process that requires energy to move substances across the cell membrane is called

.

Open Ended

Explain the difference between passive and active transport in terms of energy usage and direction of movement relative to the concentration gradient.

Multiple Choice

Which of the following is NOT a type of passive transport?

• Simple Diffusion

• Facilitated Diffusion

• Osmosis

• Endocytosis

Multiple Choice

What happens when the concentration gradient is the same throughout a given area?

• Particles stop moving completely

• Dynamic equilibrium is reached

• Particles move only in one direction

• The area becomes hypertonic

Fill in the Blanks

A concentration gradient is the difference in the

of a substance in a space.

Fill in the Blanks

During simple diffusion, substances move from an area of

concentration to an area of low concentration.

Multiple Select

Which of the following statements about simple diffusion are correct?

• It requires energy from the cell

• It moves substances from high to low concentration

• It continues until equilibrium is reached

• It involves movement through the phospholipid bilayer