Share Cells Unit 1 Module B HMH Science Complete
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In biology, the smallest unit that can perform all life processes.
cells
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
cell membrane
An organism that consists of more than one cell
multicellular organism
One of the smallest bodies that are found in the cytoplasm of a cell and that are specialized to perform a specific function
organelle
A living thing; anything that can carry out life processes independently
organism
An organism that consists of a single cell
unicellular organism
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
nucleus
In eukaryotic cells, the organelle that is the site of cellular respiration, which releases energy for use by the cell
mitochondria
An organelle found in plant and algae cells where photosynthesis occurs
chloroplast
a rigid structure that surrounds the cell membrane and provides support to the cell
cell wall
One of the alternative forms of a gene that governs a characteristic, such as hair color
allele
Reproduction that does not involve the union of sex cells and in which one parent produces offspring that are genetically identical to the parent
asexual reproduction
An action that an individual carries out in response to a stimulus or to the environment.
behavior
In a eukaryotic cell, one of the structures in the nucleus that are made up of DNA and protein; in a prokaryotic cell, the main ring of DNA
chromosome
The body system made up of the heart, the blood vessels, and the blood
circulatory system
The organs that break down food so that it can be used by the body
digestive system
