Nucleic Acids

Question 1

antiparallel

Answer 1

the subunits run in opposite directions

Question 2

Five structural features of DNA

Answer 2

1) Double-stranded (alpha) helix
2) Uniform diameter
3) Right-handed twist
4) %A=%T and %C=%G (Chargaff’s Rules)
5) Strands are antiparallel

Question 3

Components of DNA and RNA?

Answer 3

Five carbon sugar (pentose)
Nitrogenous base
1-3 phosphate groups

Question 4

Bonds between the bases of DNA. drive the formation of the double helix

Answer 4

Hydrogen Bonds

Question 5

Chargaff’s rules?

Answer 5

1) DNA base composition varies between species

2) The percentages of A and T bases are roughly equal, as are those of G and C bases

Question 6

nitrogenous bases - DNA

Answer 6

Adenine & Thymine

Guanine & Cytosine

Question 7

nitrogenous bases - RNA

Answer 7

Adenine & Uracil

Guanine & Cytosine

Question 8

Shapes of RNA & DNA

Answer 8

DNA - uniform because of pairs of nitrogenous bases being equal
RNA - unpredictable

Question 9

bonds between nitrogenous bases

Answer 9

hydrogen bonds

Question 10

what’s a nucleotide?

Answer 10

One molecule of each: sugar, phosphate, nitrogenous base