UNE Medical Biochemistry Exam 1 UPDATED ACTUAL Questions with CORRECT Answers

UNE Medical Biochemistry Exam 1
UPDATED ACTUAL Questions with
CORRECT Answers
what percentage of water is in the body? - CORRECT ANSWER - 60%



Relationship between protons and acids & bases - CORRECT ANSWER - Acids donate
proton. Bases accept proton


Strong Acids Vs Weak Acids - CORRECT ANSWER - Strong acids fully dissociate
(100%) and weak acids partially dissociate


properties of water - CORRECT ANSWER - dipole dipole
polar
H bonding
dissolves electrolytes ( CL /Na)
Small Kd- doesn't dissociate alot


kw ion product - CORRECT ANSWER - 10^-14



pH - CORRECT ANSWER - -log[H+]



biological PH - CORRECT ANSWER - 7.4



types of buffers - CORRECT ANSWER - phosphates, bicarbonate, proteins



Buffers - CORRECT ANSWER - weak acid and conjugate base

, Ka - CORRECT ANSWER - how well acid can dissociate



pka - CORRECT ANSWER - -log(Ka)
50%dissociation


Buffers work best when? - CORRECT ANSWER - ph=pka
within +/- 1 ph unit of pka


Henderson-Hasselbalch equation - CORRECT ANSWER - pH= pka + log A-/HA



pH<pKa - CORRECT ANSWER - protonated



pH>pKa - CORRECT ANSWER - ionized



amino acids are linked together by - CORRECT ANSWER - peptide bonds between
carboxyl and amino group


what's special about histidine pka? - CORRECT ANSWER - close to biological PH of 7.4
so it can act as an donor or acceptor


nonpolar amino acids - CORRECT ANSWER - glycine
alanine
proline
valine
leucine
isoleucine


Aromatic Amino Acids - CORRECT ANSWER - phenylalanine, tyrosine, tryptophan