BIOL 3090 Chapter 5 (Test 2) with Complete Solutions

BIOL 3090 Chapter 5 (Test 2) with Complete
Solutions

Nitrogenous base

What are the components
Ribose (or deoxyribose)
of a nucleotide?

1-3 Phosphates

What is the difference Nucleosides do not have a phosphate
between a nucleotide and
a nucleoside?

the nitrogen-carbon linkage between the 9' nitrogen
What's the N-glycosidic
of purine bases or 1' nitrogen of pyrimidine bases and
bond?
the 1' carbon of the sugar group.

Which is more stable in , Deoxyribose is more stable because the 2' -OH in
Ribose RNA (rNTPs) or 2- Ribose makes RNA very unstable
deoxyribose(dNTPs)
DNA? and why?

What are the purines? Adenine and Guanine



Adenine




Guanine

, What are the pyrimidines? Thymine/Uracil and Cytosine



Uracil




Thymine




Cytosine



5’ phosphate
3’ hydroxyl
A single polynucleotide
phosphodiester bonds
DNA chain has?
synthesis is ALWAYS
in the 5’ to 3’ direction.

G pairs with C using 3 hydrogen bonds
What are the base pairing
rules?
A pairs with T using 2 hydrogen bonds

sugar-phosphate outside, inward
backbones are on the
_________
with bases projected
__________

anti-parallel, meaning one chain runs 3'-5' while the
Strands of DNA are ____.
other runs 5'-3'

Base pairs are nearly _______ perpendicular (actually a 6 degree tilt)
to the axis of the helix