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12 Cards in this Set
- Front
- Back
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What is traits?
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The word that describes the physical differences that make organisms unique is traits.
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What does DNA stand for?
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DNA stands for deoxyribonucleic acid.
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How is DNA divided?
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DNA is divided into sections called genes; different genes control different traits of an organism.
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What does DNA do?
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DNA is the molecule that makes up chromosomes,directs cell's activities, and determines all of an organism's traits.
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Do all the cells of your body contain the same DNA?
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All of your body cells
contain the same DNA - your tongue cells, liver cells, bone cells, skin cells and so on. |
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Why do different body parts look different even though they contain the same DNA?
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The reason different body parts look different, even though they contain the same DNA is because different genes are exerting control over your cell's activities and structures.
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What does DNA look like?
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DNA looks like a long twisted ladder, called the double helix.
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What are the bases and what do they attach to?
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The bases are A, T, C and G. A can only attach to T (AT) and C can only attach to G (CG).
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What is the 'ladder" made up of?
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The "ladder" is made up of smaller molecules called bases.
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What do base pairs form?
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These base pairs form rungs of the DNA ladder and groups of DNA pairs make up genes.
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How many genes make up a chromosome?
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Tens of thousands of genes make up each human chromosome.
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How many chromosomes do humans have?
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Humans have 46 chromosomes.
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