BR: BIOCHEM 3.0 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS
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BR BIOCHEM
Institution
BR BIOCHEM
BR: BIOCHEM 3.0 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS
what are the nucleic acids
DNA and RNA
DNA and RNA are composed of
phosphate, pentose sugar (ribose and deoxyribose) and nitrogenous base
the formation of deoxyribose from ribose is what type of reaction
reduction because you ...
phosphate, pentose sugar (ribose and deoxyribose) and nitrogenous base
the formation of deoxyribose from ribose is what type of reaction
reduction because you gain an H
what are the nitorgenous bases
purines and pyrimidines
purines
adenine and guanine
pure as gold
pyrimidines
cytosine and thymine
uracil (RNA only)
we break down purines to get what
uric acid
purine nitrogen is derived from
3 amino acids:
aspartate, glycine, glutamine
, what are the intermediates in purine breakdown
xanthine and hypoxanthine
what is the rate limiting enzyme of purine breakdown
xanthine oxidase
structure of nucleosides
pentose sugar and nitrogenous base
structure of nucleotides
pentose sugar, nitrogenous base, and phosphate
what is DNA associated with
histones
chief component of chromatin - spools around which DNA wraps
base pairing in DNA
A-T
G-C
base pairing in RNA
single stranded so no base pairing
uracil replaces thymine
phosphodiester bonds are present
in both DNA and RNA
phosphodiester bond linkage
covalent bonds
connect 3' carbon of one sugar to 5' carbon of another sugar
(ribose in RNA and deoxyribose in DNA)
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