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