a rigid structure that surrounds the cell membrane and provides support to the cell

A molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate processes in the body.

A phospholipid layer that covers a cell's surface and acts as a barrier between the inside of a cell and the cell's environment

In a eukaryotic cell, a membrane-bound organelle that contains the cell's DNA and has a role in processes such as growth, metabolism, and reproduction

A group of similar cells that perform a common function.

An organism that consists of more than one cell

A haploid reproductive cell that unites with another haploid reproductive cell to form a zygote

One of the alternative forms of a gene that governs a characteristic, such as hair color

The ability to store and recall past experience.

A plant embryo that is enclosed in a protective coat.

The trasfer of pollen from the male reproductive structures to the female structures of seed plants.

An organelle found in plant and algae cells where photosynthesis occurs