These divide DNA during cell division.

A membrane bound organelle that contain enzymes. Defends cells from bacteria and viruses.

Makes plants green by carrying out the process of photosynthesis.

GIves protection support and shape to the cell

Allows some, but not all materials to cross through.

Drives molecules across a membrane from a region of lower concentration to a region of higher concentration.

Is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.

Is the movement of molecules across a cell membrane without energy input from the cell.

is the difference of concentration from one location to another

A _________ is a protein that detects a signal molecule and performs an action in response.

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