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Life Science Chapter 3 Vocabulary
Terms in this set (35)
The basic unit of structure and function in living things.
1. All things are composed of cells.
2. Cells are the basic units of structure and function in living things.
3.All cells are produced from other cells.
Single-celled organisms (like bacteria).
Composed of many cells.
A group of similar cells that work together to perform a specific function.
Made up of different kinds of tissues that work together.
A group of organs that work together.
Smaller structures inside a cell that carry out specific functions within the cell.
A rigid layer of nonliving material that surrounds the cells of plants and some other organisms.
A protein framework inside the cells of animals and many single-celled organisms that give the cells their shape.
The outside boundary that separates the cell from its environment. The cell membrane controls what substances come into and out of a cell.
The cell's control center, directs all of the cell's activities including reproduction.
The region between the cell membrane and the nucleus which contains a gel-like fluid. Many organelles are contained in the cytoplasm.
An rod-shaped organelle which are considered the "power-houses" of the cell because they convert energy from food molecules to energy the cell can use to carry out it's functions.
A maze of passageways where proteins and other materials are formed.
Grainlike bodies attached to the surface of the endoplasmic reticulum which produce proteins. Some ribosomes float in the cytoplasm.
The cell's "mail room". Organelles that receive, package, distribute and transport materials to other parts of the cell.
Only plants and some other organisms have these green organelles which capture energy from sunlight and use it to produce food. This is what makes leaves green.
A large water-filled sac floating in the cytoplasm. This is the storage area of plant cells.
The cell's "clean-up crew". Small, round structures contain chemicals that break down certain materials in the cell.
Any substance that cannot be broken down into simpler substances.
When two or more elements combine chemically.
An energy rich organic compound made of the elements carbon, hydrogen, and oxygen.
Large organic molecules made up of carbon, hydrogen, oxygen, nitrogen and sometimes sulfur that are made up of smaller molecules called amino acids.
The 20 smaller molecules that combine in different ways to form all the thousands of different proteins.
A type of protein that speeds up a chemical reaction in a living thing.
Fats, oils and waxes are all lipids which are rich organic compounds made of carbon, hydrogen and oxygen which are an energy source and make up most of the cell membrane.
Long organic molecules made of carbon, oxygen, hydrogen, nitrogen and phosphorus. Nucleic acids contain the instructions that cells need to carry out all the functions of life.
A type of nucleic acid. Deoxyribonucleic acid is the genetic material that carries information about an organism and is passed from parent to offspring. DNA directs all the cells unctions.
Ribonucleic acid plays an important role in the production of proteins and is found in the cytoplasm and nucleus.
Some substances can pass through a membrane while others cannot.
The main method by which small molecules move across the cell membrane.
The diffusion of water molecules through a selctively permeable membrane.
The movement of dissolved materials through a cell membrane without using cellular energy.
The movement of materials through a cell membrane using cellular energy.
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