3.3 DNA Structure

Question 1

What are nucleic acids made of?

Answer 1

nucleotides

Question 2

What are the 3 nucleotides?

Answer 2

pentose sugar, phosphate, nitrogen base

Question 3

What are the pentose sugar in DNA?

Answer 3

ribose or deoxyribose

Question 4

What are the nitrogenous bases?

Answer 4

adenine, thymine, cytosine, guanine

Question 5

What are the purines?

Answer 5

adenine, guanine

Question 6

What are the pyrimidines?

Answer 6

cytosine, thymine, and uracil

Question 7

What are purines?

Answer 7

two carbon nitrogen ring bases

Question 8

What are pyrimidines?

Answer 8

one carbon nitrogen ring bases

Question 9

Which nitrogenous bases bond?

Answer 9

adenine and thymine, guanine and cytosine

Question 10

What and how many bonds between adenine and thymine?

Answer 10

2 hydrogen bonds

Question 11

What and how many bonds between guanine and cytosine?

Answer 11

3 hydrogen bonds

Question 12

What is the structure of DNA?

Answer 12

double helix with backbone composed of alternating sugars and phosphates, anti-parallel

Question 13

How is DNA joined?

Answer 13

The phosphate group (attached to the 5’-C of the sugar) joins with the hydroxyl (OH) group attached to the 3’-C of the sugar