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SCIENCE CH4: Genes and DNA
Ch4 of Cells, Heredity, and Classification
Terms in this set (12)
deoxyribonucleic acid, a molecule that is present in all living cells and that contains the information that determines the traits that a living thing inherits and needs to live
in a nucleic-acid chain, a subunit that consists of a sugar, a phosphate, and a nitrogen base
ribonucleic acid, a molecule that is present in all living cells and that plays a role in protein production
a cell organelle composed of RNA and protein; the site of protein synthesis
a change in the nucleotide-base sequence of a gene or DNA molecule
List three important events that led to understanding the structure of DNA.
Chargaff's Rules, Franklin's Discovery, Watson and Crick's Model
found that the amount of adenine in DNA always equals the amount of thymine, amount of guanine always equals the amount of cytosine; his rules later helped scientists understand the structure of DNA.
Her X-ray diffraction images suggested that DNA has a spiral shape
Watson and Crick's Model
After seeing Franklin's X-ray images, concluded that DNA must look like a long, twisted ladder. They made a model which eventually helped explain how DNA is copied and how it functions in the cell.
Describe the basic structure of a DNA molecule.
The DNA molecule looks like a twisted ladder. The two halves are long strings of nucleotides. The rungs are complementary pairs of bases.
Explain how DNA molecules can be copied.
During replication, a DNA molecule is split down the middle, where the bases meet. The bases on each side of the molecule are used as a pattern for a new strand. As the bases on the original molecule are exposed, complementary nucleotides are added to each side of the ladder. Two DNA molecules is old DNA, and half is new DNA.
Which of the following is NOT part of a nucleotide?
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