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 eukaryotic cells, the organelle that is the site of cellular respiration, which releases energy for use by the cell

The body system made up of the heart, the blood vessels, and the blood

A plant structure that provides support and transports nutrients.

A genetically determined characteristic

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

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

One of the smallest bodies that are found in the cytoplasm of a cell and that are specialized to perform a specific function

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

The organ system whose primary function is movement and flexibility.

The organs that break down food so that it can be used by the body

The system that collects and excretes nitrogenous wastes and excess water from the body in the form of urine.