12.2- The Structure of DNA
If the percent of guanine, in a DNA sample, is 20%, what is the percent of cytosine?
20%
If the percent of adenine, in a DNA sample, is 31.5%, what is the percent of thymine in the same DNA sample?
31.5%
"A" stands for ______.
Adenine
Name the four kinds of nitrogenous bases that DNA contains.
Adenine, Guanine, Cytosine, and Thymine
In a Double-Helix Model, what three components make up a nucleotide?
Nitrogen base, a phosphate group, and a deoxyribose sugar.
In DNA, what can be joined in any order?
Nucleotides
Deoxyribose sugars are represented as a what on a Double-Helix model?
Pentagon
The nucleotides in DNA are joined by _______ bonds.
covalent
The building blocks of DNA are ________.
nucleotides
Phosphate Groups are represented as a what on a Double-Helix model?
Circle
Determine the function of the DNA molecule by the structure of the molecule: When hydrogen bonds break and the strands pull apart
Copy Information
"C" stands for _______.
Cytosine
Name the Scientist: This scientist showed that percentages of adenine and thymine are equal in the DNA of a species, as are the percentages of guanine and cytosine.
Erwin Chargaff
Give an example of a base pair.
G and C or T and A
"G" stands for ________.
Guanine
What can form between certain nitrogen bases?
Hydrogen Bonds
Name the Scientist: This scientist built a model of the DNA molecule that explained both the structure and properties of DNA.
James Watson and Francis Crick
Name the Scientist: This scientist took X-ray diffraction pictures that revealed the double-helix structure of DNA.
Rosalind Frankilin
Determine the function of the DNA molecule by the structure of the molecule: Each strand of the double-helix carries a sequence of bases, arranged something like letters in a four-letter alphabet
Store Information
"T" stands for _____.
Thymine
Determine the function of the DNA molecule by the structure of the molecule: When DNA is copied, the sequence of base pairs is copied, so genetic information can pass unchanged from one generation to the next
Transmit Information
True or False: A=T and G=C
True
Nucleotides in DNA are made up of three basic components: a sugar called ______, a ________, and a nitrogenous ________.
a sugar called deoxyribose, a phosphate group, and a nitrogenous base