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Science 9 Chapter 4
Science 9 Chapter 4 (Reproduction)
6
Science
9th Grade
12/01/2011

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Term
Chromosomes 
Definition
a threadlike structure in a cell nucleus that carries genes  
Term
DNA
Definition
A biologicl molicule found in the cell nucleus tha carries genetic info composed of sugar, phosphate & 4 different bases (guanine, cytosine, adenine & thymine) passed on from generation to generation durnig reproduction
Term
Gene
Definition
Segment of DNA located at a specific place on a chromosome.  Each contain info to produce proteins 
Term
Nucleolus
Definition
A membrane free organelle that floats in the interior of the nucleus & makes ribosomes 
Term
Nucleus
Definition
An organelle that controls all the activities within a cell
Term
Protien
Definition
Essential materials required for the cell to carry out the activities necessary for its survival
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