DNA Scientist

DNA stands for-

Which of the following is not a nucleotide for DNA?

• cytosine

• guanine

• uracil

• thymine

What does DNA look like?

Answer explanation

DNA is a double-stranded helix that contains four nucleotides that base-pair with one another. There is also a 3' and 5' terminus.

How many pairs of chromosomes do humans have?

Answer explanation

There are 23 pairs and 46 total chromosomes.

Which scientist is considered the "father of genetics"?

• Griffith

• Levine

• Hershey & Chase

• Mendel

DNA was determined to be a "transforming agent" through the experiment of-

• Levine

• Griffith

• Avery, MacLeod & McCarthy

• Watson & Crick

What is Chargaff's rule?

Answer explanation

2 major findings:

1. reported that DNA composition varies from one species to another

2. A=T, G=C in terms of percentage

What phage was used by Alfred Hershey and Martha Chase? What did it help prove?

Answer explanation

Phage: T2

What did the experiment prove? That DNA was used by the phage to infect cells, not some other substance like protein.

What were the contributions of Rosalind Franklin and Maurice Wilkins?

• DNA composed of two parallel sugar-phosphate backbones

• used X-ray crystallography to study DNA structure

• nitrogenous bases were paired in the interior of the molecule

• one purine and one pyrimidine base-pair with one another

Answer explanation

anti-parallel not parallel

Who isolated DNA from pus and determined there was no sulfur? What was concluded from this?