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Genetics PCB 3063 Exam 3 Questions And Answers Rated 100% Correct
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Rosalind Franklin and Maurice Wilkins - ️️DNA is a multiple-stranded fiber of 20 A thickness. Groups spaced 3.4 A along the fiber and a repeating unit every 34 A. Purines - ️️Two fused heterocyclic rings A, G Pyrimidines - ️️One single heterocyclic ring T, U, C Nucleotide Sugars -...

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  • October 16, 2024
  • 10
  • 2024/2025
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Genetics PCB 3063 Exam 3
Rosalind Franklin and Maurice Wilkins - ✔️✔️DNA is a multiple-stranded fiber of 20 A
thickness. Groups spaced 3.4 A along the fiber and a repeating unit every 34 A.

Purines - ✔️✔️Two fused heterocyclic rings

A, G

Pyrimidines - ✔️✔️One single heterocyclic ring
T, U, C

Nucleotide Sugars - ✔️✔️Ribose
Deoxyribose (Base is always attached to C-1' of the sugar.

Phosphates - ✔️✔️Can be attached to the C-5' of the sugar.

Deoxyribonucleo-side - ✔️✔️Base + Sugar

Deoxyribonucleo-tide - ✔️✔️Base + Sugar + Phosphate

Adjacent nucleotides are linked by... - ✔️✔️5'-3' Phosphodiester Bonds

A nucleotide has what on each end? - ✔️✔️A free 5' phosphate
A free 3' hydroxyl

Erwin Chargaff - ✔️✔️A=T
C=G

Nucleotide - ✔️✔️Repeating structural unit of DNA and RNA. Composed of a
nitrogenous base, a sugar, and a phosphate.


DNA is a helical structure that is not a single strand and consists of about 10 base pairs
per complete turn.

Watson and Crick - ✔️✔️Solved DNA structure

The Double-Helix - ✔️✔️Two anti-parallel strands.

Sugar-phosphate backbone on the outside.

Nitrogenous bases "stacked" on the inside.

, The double-helix has how many bp per complete twist? - ✔️✔️10

Which direction does the double-helix turn? - ✔️✔️Right-handed / Clockwise

The two strands of the double-helix are held together by... - ✔️✔️Hydrogen bonds
between complementary bases.

A=T two hydrogen bonds
C=G three hydrogen bonds

B-DNA - ✔️✔️10bp/turn
Biologically favored.
Parallel bases.

A-DNA - ✔️✔️11bp/turn; 23 A diameter
Prevalent under high salt concentrations/low water conditions.
Doubtful to occur under biological conditions.

C-DNA - ✔️✔️9.3bp/turn; 19A diamether
Prevalent under great dehydration conditions
Doubtful to occur under biological conditions.

Z-DNA - ✔️✔️Prevalent in vitro in C-G containing DNA.
Left-handed.
12bp/turn; 18 A diameter
Zig-Zag conformation
May be involved in regulating gene expression in vivo.

RNA Structure - ✔️✔️Ribose
A=U
C=G
Usually single stranded, but can form short ds regions.

RNA Double Helix - ✔️✔️Right handed
A form. 11-12 base pairs per turn.

What is the structural difference between the sugar found in RNA and the sugar found
in DNA? - ✔️✔️The presence of a 2' hydroxyl.

What order of atoms correctly describes the backbone of a DNA strand? - ✔️✔️3'C-O-
P-O-5'C

What aspect of the sugar is unique to RNA? - ✔️✔️It contains an OH group on the
number 2' carbon of the pentose sugar.

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