Genetics PCB 3063 Exam 3 Study Guide
Solutions
Nucleotide - ANSWER-Repeating structural unit of DNA and RNA. Composed of a nitrogenous base, a
sugar, and a phosphate.
Purines - ANSWER-Two fused heterocyclic rings
A, G
Pyrimidines - ANSWER-One single heterocyclic ring
T, U, C
Nucleotide Suga...
The double-helix has how many bp per complete twist? - ANSWER✔✔-10
Which direction does the double-helix turn? - ANSWER✔✔-Right-handed / Clockwise
The two strands of the double-helix are held together by... - ANSWER✔✔-Hydrogen bonds between
complementary bases.
A=T two hydrogen bonds
C=G three hydrogen bonds
B-DNA - ANSWER✔✔-10bp/turn
Biologically favored.
Parallel bases.
A-DNA - ANSWER✔✔-11bp/turn; 23 A diameter
Prevalent under high salt concentrations/low water conditions.
Doubtful to occur under biological conditions.
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