Ap Psychology Worksheet

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1. a) The three parts of a nucleotide are phosphate, deoxyribose sugar, and nitrogen containing bases.

b) Deoxyribose sugar is a kind of sugar found in a nucleotide.

c) The base of a nucleotide contains Nitrogen

d) The four nitrogen bases in Model 1 are guanine, adenine, thymine, and cytosine.

2. b) The nitrogen bases make up the rungs of the "ladder".

c) Deoxyribose sugar and phosphate make up the backbone of the "ladder".

d) The rungs are antiparallel.

3. C---G

T--A

A--T

G---C

C---G

T--A

4. In a nucleotide, adenine is attached to thymine.

5. Two hydrogen bonds connect adenine and thymine.

6. Cytosine is attached to guanine on the opposite nucleotide strand.

7. Three hydrogen bonds connect guanine to cytosine.

8. In DNA, adenine …show more content…
AT, TA, CG, CG, AT, GC

10. It looks like a ladder was twisted in opposite directions in a coil shape.

11. 4

1

2

3

12. a) DNA helicase is an enzyme.

b) The DNA helicase breaks hydrogen bonds between nitrogen bases.

13. The complimentary base-pair rule is used to join the free nucleotides to the exposed bases of the DNA.

14. This type of replication is called semi-conservation replication because at least half of the nitrogen base pair has to be conserved in order to replicate DNA. The DNA is replicated by combining the halves of the old DNA with free nucleotides.

15. Semi-conservation replication forces half of the old DNA to be used as a template for DNA replication. This template has the same order of nitrogen bases that will form hydrogen bonds with the same nitrogen bases they were paired with because of the complementary base-pair rule. This helps to prevent mutations because the new DNA copies are the same as the old ones thanks to the complementary base-pair rule and the fact that half of the old DNA is being used as a template for the copy.

16.
Organism

Percentage of each type of base
Adenine Guanine Cytosine Thynine
Human 31 19 19 31
Cow 28 22 22 28
Salmon 29 21 21 29
Wheat 27 23 23 27
Yeast 31 19 19
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