nucleotide structure

Question 1

draw the structure of a nucleotide

Answer 1

• (refer to images)
• phosphate group - 5 carbon sugar - nitrogenous base

Question 2

name the pentose sugar in DNA

Answer 2

deoxyribose

Question 3

name the pentose sugar in RNA

Answer 3

ribose

Question 4

name the purine bases and describe their structure

Answer 4

• adenine (C5H5N5)
• guanine (C5H5N5O)
• two / double ringed molecules

Question 5

name the pyrimidine bases and describe their structure

Answer 5

• thymine (C5H6N2O2)
• cytosine (C4H5N3O)
• uracil (C4H4N2O2)
• single ringed molecules

Question 6

name the complementary base pairs in DNA

Answer 6

• 2 H-bonds between adenine and thymine (AT)
• 3 H-bonds between guanine and cytosine (GC)

Question 7

name the complementary base pairs in RNA

Answer 7

• 2 H-bonds between adenine and uracil (AU)
• 3 H-bonds between guanine and cytosine (GC)

Question 8

describe the structure of adenosine triphosphate (ATP) and adenosine disphosphate (ADP)

Answer 8

• nucleotide derivative of adenine
• ATP has 3 inorganic phosphate groups
• ADP has 2 inorganic phosphate groups
• both have ribose pentose sugar