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Ch 2 Section 1 & 2 Life Science

Across
picks up oxygen and delivers it through the body
the smallest unit that can carry out all the activities of life
made of two or more atoms joined together
plants, and some bacteria and protists, use the sun’s energy to make food from carbon dioxide and water
Passing traits from parent to offspring is called ___________.
Oxygen, nitrogen, and carbon dioxide are some of the gases in air (Page 27)
eat other organisms to get food
one parent makes offspring. The offspring are identical to the parent
molecules made of sugars
break down dead organisms and animal wastes to get food
molecules made of smaller molecules called nucleotides
large molecules made up of smaller molecules called amino acids
two ways organisms can produce __________ are by sexual or asexual reproduction
A change that affects how an organism acts is called a ___________.
Down
molecules that cannot mix with water
Cell membranes surround and protect cells. They are made of special lipids called ______________.
The act of keeping a constant environment inside an organism
Proteins called _________ help to start or speed up reactions inside a cell
two parents make offspring. The offspring get traits from both parents
An organism’s ___________ is all of the chemical reactions that take place in its body
make their own food using energy from their environment
Use or purpose (Page 27)
separates the cell from the outside environment
carries instructions for the organism’s traits
The simple carbohydrate __________ is the most common source of energy for cells
All living things
molecule that carries energy in cells, called adenosine triphosphate.