DNA Structure & replication review

Which of the following describes the difference between a purine and a pyrimidine?

• Purines are single ring structures while pyrimidines are double ring structures.

• Pyrimidines are single ring structures while purines are double ring structures.

• Purines are composed of single bonds while pyrimidines are composed of double bonds.

• Pyrimidines are composed of single bonds while purines are composed of double bonds.

Which of the following are purines?

• adenine

• cytosine

• guanine

• thymine

• uracil

Which of the following are pyrimidines?

• adenine

• cytosine

• guanine

• thymine

• uracil

Plasmids are ​ (a)   a bacteria's chromosomal DNA and contain important genes for survival

• separate from
• part of
• Not found in

Identify which of these statements is correct, the percent (%) of guanine is equal to the percent of

• adenine

• thymine

• cytosine

• guanine

Identify which of these statements is correct, the percent (%) of adenine is equal to the percent of

• Thymine

• Cytosine

• Adenine

• Guanine

In the DNA of a panda, there is 30% adenine. Determine the percent of guanine.

• 15%

• 40%

• 10%

• 20%

In organism #1 there is 13% thymine in a molecule of DNA, Determine the percent (%) _____ cytosine.

• 13%

• 26%

• 37%

• 74%

Chargaff's experiments showed that the amount of A, T, G and C is the same from species to species

• True
• False

If a DNA stand has 32 % guanine before semi conservative replication occurs, what percent thymine will each new strand have after replication? 

• 64%
• 32%
• 18%
• 36%