Biology  by Bradford
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1.6 Nucleic Acids: revision map

The subtopic in the middle and five tasks round it: label two diagrams, complete a table, put a process in order and fill 17 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 1 practice questionsThe whole Unit 1 map

Topic 1.6

Nucleic Acids

AP Biology · Unit 1 Chemistry of LifeName

1.6.AAntiparallel double helix

5'→3'5'→3'1234
  1. 1
  2. 2
  3. 3
  4. 4

1.6.ABase pairing

In DNA, adenine pairs with through two hydrogen bonds, and cytosine pairs with through three. The two strands run in opposite directions, so DNA is : one strand is read 5' to 3' while its partner runs 3' to 5'. Because of this pairing, a sample that is 28% adenine must be 28% of the partner base, and the remaining 44% splits evenly, so it is % cytosine.

1.6.ADNA and RNA compared

DNARNA
Sugar
BasesA, T, G, CA, , G, C
Strandsusually two, antiparallelusually
Main jobstores genetic informationcarries and uses it (mRNA, tRNA, rRNA)

Both are chains of nucleotides joined by bonds, with the bases projecting from a sugar-phosphate backbone.

Topic 1.6Nucleic Acids

1.6.AA nucleotide in a strand

POHone nucleotide1234
  1. 1
  2. 2
  3. 3
  4. 4

1.6.AReading a strand's direction

Number the steps in order.

  1. Find the end whose carbon 5 has a free phosphate group: this is the 5' end.
  2. New nucleotides can only be added to this 3' end when a strand is made.
  3. Move along the sugar-phosphate backbone, base by base.
  4. The last nucleotide has a free hydroxyl on carbon 3: this is the 3' end.
Word bank 223' endantiparallelbase pairdeoxyriboseguaninehydrogen bondsnitrogenous baseonephosphate groupphosphodiesterribosesugarsugar-phosphate backbonethymineU

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelA nucleotide in a strand

    1. phosphate group
    2. sugar
    3. nitrogenous base
    4. 3' end

  2. LabelAntiparallel double helix

    1. sugar-phosphate backbone
    2. hydrogen bonds
    3. nitrogenous base
    4. base pair

  3. TableDNA and RNA compared

    DNARNA
    Sugardeoxyriboseribose
    BasesA, T, G, CA, U, G, C
    Strandsusually two, antiparallelusually one
    Main jobstores genetic informationcarries and uses it (mRNA, tRNA, rRNA)

    Both are chains of nucleotides joined by phosphodiester bonds, with the bases projecting from a sugar-phosphate backbone.

  4. GapsBase pairing

    In DNA, adenine pairs with thymine through two hydrogen bonds, and cytosine pairs with guanine through three. The two strands run in opposite directions, so DNA is antiparallel: one strand is read 5' to 3' while its partner runs 3' to 5'. Because of this pairing, a sample that is 28% adenine must be 28% of the partner base, and the remaining 44% splits evenly, so it is 22% cytosine.

  5. OrderReading a strand's direction

    1. Find the end whose carbon 5 has a free phosphate group: this is the 5' end.
    2. Move along the sugar-phosphate backbone, base by base.
    3. The last nucleotide has a free hydroxyl on carbon 3: this is the 3' end.
    4. New nucleotides can only be added to this 3' end when a strand is made.