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HHS Life Science
chapter 2
26
Science
7th Grade
09/18/2006

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Term
What is a CELL?
Definition
the smallest unit that can perform all life processes
Term
What are the SIX (6) CHARACTERISTICS of LIVING THINGS?
Definition
1-have cells

2-sense and respond to change

3-reproduce

4-have DNA

5-use energy

6-grow and develop
Term
What is an ORGANISM?
Definition
a living thing
Term
What is a STIMULUS?
Definition
anything that causes a change in an organism
Term
What is a REACTION?
Definition
a change in an organism
Term
What is HOMEOSTASIS?
Definition
the maintenance of a constant internal state in a changing environment
Term
What is a SEXUAL REPRODUCTION?
Definition
when two (2) parents produce offspring that share characteristics of each parent
Term
What is ASEXUAL REPRODUCTION?
Definition
when one (1) parent produces offspring that are identical to the parent
Term
What is DNA?
Definition
a molecule present in all living cells, it contains the information that determines an organism's traits (characteristics)
Term
What is HEREDITY?
Definition
the passing of traits from one generation to the next
Term
What is METABOLISM?
Definition
the sum of all chemical activities in an organism
Term
What are the 4 BASIC NEEDS of organisms?
Definition
water, air, aplace to live (shelter), and food
Term
What are PRODUCERS?
Definition
organisms that make their own food using energy from their surroundings
Term
What are CONSUMERS?
Definition
organisms that eat other organisms or organic matter to get energy
Term
What is a DECOMPOSER?
Definition
organisms that get energy by breaking bown nutrients in dead organisms or animal wastes
Term
What is a MOLECULE?
Definition
substance made when two or more atoms combine
Term
What are COMPOUNDS?
Definition
substances made when moecules are not chemically combined
Term
What is a PROTEIN?
Definition
a large molecule made up of smaller monecules called amino acids
Term
What are some JOBS of PROTEIN?
Definition
1-build body structures
2-repair body structures
3-regulate body processes
Term
What are CARBOHYDRATES?
Definition
molecules made of sugars that are used as a source of energy and are also used to store energy
Term
List and describe the TWO (2) KINDS OF CARBOHYDRATES
Definition
1-simple - made of 1 sugar molecule ar a few sugar molecules that are linked together

2-complex - made of hundreds of linked sugar molecules
Term
What are LIPIDS?
Definition
compounds that do not dissolve in water; includes fats, oils, and steroids
Term
What are PHOSPHOLIPIDS?
Definition
molecules that form the cell membrane
Term
What is the difference between FATS and OILS?
Definition
most fats are solid at room temperature while most oils are lipuid at room temperature
Term
What is ATP?
Definition
a molecule that acts as the main energy source for cell processes
Term
What is a NUCLEIC ACID?
Definition
a large molcule that holds all of the information that a cell needs to make proteins
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