What is the primary function of the cell membrane?

To regulate the passage of substances into and out of the cell

To provide structural support to the entire organism

Which three main components make up a phospholipid molecule?

Glycerol, phosphate, and fatty acids

Protein, carbohydrate, and water

How do phospholipid molecules arrange themselves in a bilayer within the cell membrane?

Water-loving heads face outwards, and water-hating tails face inwards

Water-loving heads face inwards, and water-hating tails face outwards

They randomly scatter throughout the membrane

They form a single layer with tails exposed to water

What is the primary function of junction proteins in cell membranes?

To link to proteins on nearby cell membranes.

To receive chemical signals from outside the cell.

To help chemical reactions occur.

To transport substances across the membrane.

Which of the following best describes diffusion?

Movement of a chemical from where it's more concentrated to where it's less concentrated.

Movement of a chemical from where it's less concentrated to where it's more concentrated.

Movement of water across a semi-permeable membrane.

Movement of substances that requires energy.

What is facilitated diffusion?

Passive transport that requires a transport protein.

A type of active transport that uses ATP.

The movement of water across a membrane.

The direct passage of nonpolar substances through the membrane.

What is a key characteristic of active transport?

It uses ATP to move substances in a needed direction.

It moves substances from a high concentration to a low concentration.

It only transports water molecules.

Which biomolecule is primarily responsible for long-term energy storage, and which is mainly involved in structural support and enzyme activity?

Lipids store energy, proteins provide structural support and enzyme activity

Proteins store energy, lipids provide structural support

Lipids and proteins both store energy equally

Proteins store energy, while lipids provide enzyme activity

Which of the following best describes how heart rate contributes to homeostasis during exercise?

Heart rate increases to maintain oxygen and nutrient balance in active muscles.

Heart rate decreases to maintain a stable body temperature.

Heart rate increases to remove waste from the body.

Heart rate remains unchanged, ensuring energy efficiency.

What is the role of ATP in active transport?

It provides the energy needed to move molecules against their concentration gradient

It provides energy for molecules to move passively across the membrane

It is not required for active transport

It is used to break down molecules during transport

In which direction do molecules move during active transport?

In both directions without using energy

Only along the concentration gradient

What is the primary function of carrier proteins in cellular transport?

To bind and transport specific molecules across the membrane

To create pores for passive movement of molecules

To facilitate the movement of water through the membrane

What is the main difference between protein pumps and carrier proteins?

Protein pumps use ATP to move molecules against the concentration gradient, while carrier proteins do not always require energy.

Carrier proteins transport only large molecules, while protein pumps only transport small ions.

Protein pumps change the shape of the entire membrane, while carrier proteins do not.

Carrier proteins only move molecules through osmosis, while protein pumps move molecules through diffusion.

Which of the following best describes the difference between endocytosis and exocytosis?

Endocytosis brings materials into the cell, while exocytosis removes materials from the cell.

Endocytosis releases waste from the cell, while exocytosis absorbs nutrients.

Endocytosis only occurs in plant cells, while exocytosis only occurs in animal cells.

Both endocytosis and exocytosis involve passive transport of molecules.

Active Cell Transport

Active cell transport

Interactive Video

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Science

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9th - 12th Grade

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NGSS

MS-ESS1-1, MS-LS1-2, HS-LS1-7

Standards-aligned

Lesya White

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42 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following types of cells have a cell membrane?

Only prokaryotic cells

Only eukaryotic cells

Both prokaryotic and eukaryotic cells

Neither prokaryotic nor eukaryotic cells

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Active cell transport

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Which of the following types of cells have a cell membrane?

Label the following parts on the cell diagram:MitochondriaLipid layerProtein channel

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Label the following parts on the cell diagram:
Mitochondria
Lipid layer
Protein channel