2008biology test_2review with my info

2008biology test_2review with my info - Review Sheet 1) DNA...

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Review Sheet 1) DNA a. What is it? Definition of DNA, Chromosomes, Genes, and Bases. DNA: it is the genetic chemical found in all living things Chromosomes: it is a thread like structure that contains genetic information Genes: a unit of genetic information that determines a specific characteristic of an individual ***Bases: b. The different levels of organization- DNA , Chromosomes, Genes, Bases b.i. What are they? DNA: DNA forms a long shape called a helix. This helix has 2 mains strands so it’s a double helix. DNA carries all of the information necessary for normal cellular functioning DNA is the same in all living things DNA is organized into chromosomes, human cells carry 46 chromosomes DNA is like a cookbook that is so large it comes in many volumes. Chromosomes: A long thread of DNA, a portion of genetic materials There are 44 ‘autosomes’ (regular) chromosomes in human there a 2 ‘sex chromosomes’, in a woman they are XX and a man they are XY 1 chromosomes is like 1 volume of a multi-volume cookbook set Genes: Agene is a long section of DNA hat determines a characteristic. Eg. Hair color, eye color, skin color etc. There can be 1,000 genes per chromosomes A gene is like a ‘recipe’ in a volume of the cookbook. Each gene produces a protein, just like a recipe ‘produces’ a dish/meal Bases Each gene is made up of a series of chemicals called nitrogen bases
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The four bases which form the code are called (A) adenine, (T) thymine, (C) cytosine and (G) guanine. They can only pair up: And T and These bases appear in a particular order forming a code The bases are like the letters that spell out the words that give the directions of a recipe. i. Analogy to explain their relationship(what do you mean by relationship) DNA Encyclopedia of cooking Chromosomes volumes Genes recipe Bases letters Product: protein Product: a yummy desert 2) Cell Cycle- a. What is it? Definition The cells cycle is the cells life span The cell cycle is the sequence of events in a cell from one division to an other b. How many stages? b.i. Interphase- G1-S-G2
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Cell Division c. Why is it important? It is important because if humans and animals did not have it then our cells would not reproduce and we kill millions of cells every day without meaning too and if the cells did not divide then we would have whole in our bodies and soon enough we would shrink and die. d.
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2008biology test_2review with my info - Review Sheet 1) DNA...

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