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UNE Medical Biochemistry Exam 1 -Questions/Answers
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UNE Medical Biochemistry Exam 1 -Questions/Answers
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UNE Medical Biochemistry Exam 1 -Questions/AnswersWhat percentage of water is in the body? Correct Ans - 60%
Relationship between protons and acids & bases Correct Ans -
Acids donate proton. Bases accept proton
Strong Acids Vs Weak Acids Correct Ans - Strong acids fully
dissociate (100%) and weak acids partially dissociate
properties of water Correct Ans - dipole dipole
polar
H bonding
dissolves electrolytes ( CL /Na)
Small Kd- doesn't dissociate alot
kw ion product Correct Ans - 10^-14
pH Correct Ans - -log[H+]
biological PH Correct Ans - 7.4
types of buffers Correct Ans - phosphates, bicarbonate, proteins
Buffers Correct Ans - weak acid and conjugate base
Ka Correct Ans - how well acid can dissociate
pka Correct Ans - -log(Ka)
50%dissociation
Buffers work best when? Correct Ans - ph=pka
within +/- 1 ph unit of pka
Henderson-Hasselbalch equation Correct Ans - pH= pka + log
A-/HA
pH<pKa Correct Ans - protonated
, pH>pKa Correct Ans - ionized
amino acids are linked together by Correct Ans - peptide bonds
between carboxyl and amino group
what's special about histidine pka? Correct Ans - close to biological
PH of 7.4 so it can act as an donor or acceptor
nonpolar amino acids Correct Ans - glycine
alanine
proline
valine
leucine
isoleucine
Aromatic Amino Acids Correct Ans - phenylalanine, tyrosine,
tryptophan
polar uncharged amino acids Correct Ans - asparagine
glutamine
serine
threonine
sulfur containing amino acids Correct Ans - methionine
cysteine
charged amino acids Correct Ans - aspartate
glutamate
arginine
lysine
histidine
which 3 amino acids carry ammonia? Correct Ans - glutamine,
glutamate, alanine
which 3 amino acids can be phosphorylated? Correct Ans - serine,
threonine, tyrosine
pka of COOH and NH2 Correct Ans - 2 and 9
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