🤗HW25: 11.17

Front

What is the plasma membrane?

Back

The plasma membrane is a biological membrane that separates and protects the interior of all cells from the outside environment. It is selectively permeable, allowing certain substances to pass while blocking others.

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What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the need for energy input. It occurs along the concentration gradient, from areas of higher concentration to areas of lower concentration.

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What are the types of passive transport?

Back

The main types of passive transport are diffusion, osmosis, and facilitated diffusion.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until they are evenly distributed.

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What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the plasma membrane without using energy.

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What is cell theory?

Back

Cell theory is a fundamental concept in biology that states: 1) All living things are made of cells, 2) Cells are the basic unit of life, and 3) All cells come from pre-existing cells.

Front

What is the function of mitochondria?

Back

Mitochondria are known as the powerhouse of the cell. They generate ATP (adenosine triphosphate), which is used as energy by the cell.

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What is the role of ribosomes?

Back

Ribosomes are cellular structures that synthesize proteins by translating messenger RNA (mRNA) into polypeptide chains.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.