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Holt Life Scienc Unit 4 Cells: The Basic Unit of Life
These are the vocabulary words and definitions from chapter 4, sections 1-3 from the 7th grade Life Science textbook from Holt McDougal.
Terms in this set (24)
The smallest functional and structural unit of all living organisms; usually consists of a nucleus, cytoplasm and a cell membrane.
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.
One of the small bodies in a cell's cytoplasm that are specialized to perform a specific function.
In a eukaryotic cell, a membrane-bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction.
A single-celled organism that does not have a nucleus or membrane-bound organelles; examples are archaea and bacteria.
An organism made up of cells that have a nucleus enclosed by a membrane; eukaryotes include protists, animals, plants, fungi but not archaea or bacteria.
A rigid structure that surrounds the cell membrane and provides support to the cell.
The cytoplasmic network of protein filaments that plays an essential role in cell movement, shape, and division.
A cell organelle composed of RNA and protein; the site of protein synthesis.
A system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids.
In eukaryotic cells, the cell organelle that is surrounded by two membranes and that is the site of cellular respiration.
An organelle found in plant and algae cells where photosynthesis occurs.
A cell organelle that helps makes and package materials to be transported out of the cell.
A small cavity or sac that contains materials in a eukaryotic cell; forms when part of the cell membrane surrounds the materials to be taken into the cell or transported within the cell.
A cell organelle that contains digestive enzymes.
A living thing; anything that can carry out life processes independently.
The special, normal, or proper activity of an organ or part.
The arrangement of parts in an organism.
A group of similar cells that perform a common function.
A collection of tissues that carry out a specialized function of the body.
A group of organs that work together to perform body functions.
Deoxyribonucleic Acid (DNA)
the material that contains the information that determines inherited characteristics
Nucleotides that make up DNA
a nitrogen base, a phosphate group and a sugar
- all living things are composed of one or more cells
- cells are the basic units of structure and function in an organism
- cells come only from the reproduction of existing cells
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