super read worksheet 2-1 answers

ANSWERS
Super Read! Worksheet 2.1

1.
a. Topic: structure of DNA
Main Idea: Like many great achievements, the modeling of DNA resulted from the work of many researchers.

b. Topic: structure of DNA
Main Idea: The four nitrogenous bases on DNA are adenine (A), guanine (G), cytosine (C), and thymine (T).

c. Topic: structure of DNA
Main Idea: When he analyzed the amounts of the four bases in different species, Chargaff discovered that the amount of adenine is always equal to the amount of thymine, and that the amount of cytosine is always equal to the amount of guanine.

d. Topic: structure of DNA
Main Idea: According to this model, which is now accepted as the correct structure for DNA, the DNA molecule is shaped like a twisted ladder.

e. Topic: structure of DNA
Main Idea: In this way, the nucleotides form the DNA double helix.

2.
a. Topic: Chromosomes
Main idea: Specific genes control specific traits.

b. Topic: DNA, genes, and chromosomes
Main idea: Chromosome theory of inheritance hypothesizes that each chromosome has many genes.