BCH 100 Exam -Questions With 100%
Verified Answers.
conjugates - ✔✔species that differ by 1 hydrogen only
Keq - ✔✔equilibrium constant
Kw - ✔✔ionization constant of water
pure water - ✔✔[H+] = [OH-] = 10-7M
Ka - ✔✔acid dissociation constant
Henderson-Hasselbalch Equation - ✔✔pH = pKa + log [base]/[acid]
If [base] = [acid] - ✔✔pH = pKa (Log 1 = 0)
If [base] > [acid] - ✔✔pH > pKa
if [base] < [acid] - ✔✔pH < pKa
,Equivalence point - ✔✔point in an acid-base titrationa t which enough acid has been added
to exactly neutralize base
1/2 equivalence point - ✔✔point in an acid-base titration which HALF of acid has
been neutralized, when pH = pKa
Polyprotic - ✔✔more than 1 H can be deprotonated
monoprotic acid - ✔✔release 1 H+ per mole
diprotic acid - ✔✔release 2 H+ per mole
triprotic acid - ✔✔release 3 H+ per mole
Acid-base buffer - ✔✔solution whos pH resists change upon addition of small amounts of
acid/base
effective buffer range - ✔✔about +/- 1 pH unit from pKa of acid/base
Buffer capacity - ✔✔ability of buffer to resist pH change, greater [HA] & [A-],
greation buffer capacity
acidosis - ✔✔blood pH decrease
alkalosis - ✔✔blood pH increase
4 major Biomolecule groups - ✔✔Proteins, carbohydrates, lipids, & nucleic acids
, Amino Acids - ✔✔organic molecule containing amino group (NH3+) & carboxylic acid
group (COO-), written in zwitterion form at pH ~7, over 500 amino acids w/ 20 essential ones.
Occur in L-configuration naturally
Fischer Projections - ✔✔2D representation fo rhsowing configuration of sterocenters,
horizontal lines = forward, vertical lines = backwards
chirality of amino acids - ✔✔exception of glycine, all amino acids found in proteins
have 1/more stereocenters & are chiral
Nonpolar amino acids - ✔✔Glycine (G), Alanine (A), Valine (V), Leucine (L), Isoleucine
(I), & Proline (P)
Glycine (Gly, G) - ✔✔smallest amino acid, R group = Hydrogen, achiral
Alanine (Ala, A) - ✔✔aliphatic side chains
Valine (Val, V) - ✔✔aliphatic side chains
Leucine (Leu, L) - ✔✔aliphatic side chains
Isoleucine (Ile, I) - ✔✔aliphatic side chains, has 2nd stereocenter
Proline (Pro, P) - ✔✔alpha"amino" group, 2* amine, cyclization makes P rigid, limits
protein conformation
Aromatic Amino Acids - ✔✔Tyrosine (Y), Phenylalanine (F), & Tryptophan (W)
Verified Answers.
conjugates - ✔✔species that differ by 1 hydrogen only
Keq - ✔✔equilibrium constant
Kw - ✔✔ionization constant of water
pure water - ✔✔[H+] = [OH-] = 10-7M
Ka - ✔✔acid dissociation constant
Henderson-Hasselbalch Equation - ✔✔pH = pKa + log [base]/[acid]
If [base] = [acid] - ✔✔pH = pKa (Log 1 = 0)
If [base] > [acid] - ✔✔pH > pKa
if [base] < [acid] - ✔✔pH < pKa
,Equivalence point - ✔✔point in an acid-base titrationa t which enough acid has been added
to exactly neutralize base
1/2 equivalence point - ✔✔point in an acid-base titration which HALF of acid has
been neutralized, when pH = pKa
Polyprotic - ✔✔more than 1 H can be deprotonated
monoprotic acid - ✔✔release 1 H+ per mole
diprotic acid - ✔✔release 2 H+ per mole
triprotic acid - ✔✔release 3 H+ per mole
Acid-base buffer - ✔✔solution whos pH resists change upon addition of small amounts of
acid/base
effective buffer range - ✔✔about +/- 1 pH unit from pKa of acid/base
Buffer capacity - ✔✔ability of buffer to resist pH change, greater [HA] & [A-],
greation buffer capacity
acidosis - ✔✔blood pH decrease
alkalosis - ✔✔blood pH increase
4 major Biomolecule groups - ✔✔Proteins, carbohydrates, lipids, & nucleic acids
, Amino Acids - ✔✔organic molecule containing amino group (NH3+) & carboxylic acid
group (COO-), written in zwitterion form at pH ~7, over 500 amino acids w/ 20 essential ones.
Occur in L-configuration naturally
Fischer Projections - ✔✔2D representation fo rhsowing configuration of sterocenters,
horizontal lines = forward, vertical lines = backwards
chirality of amino acids - ✔✔exception of glycine, all amino acids found in proteins
have 1/more stereocenters & are chiral
Nonpolar amino acids - ✔✔Glycine (G), Alanine (A), Valine (V), Leucine (L), Isoleucine
(I), & Proline (P)
Glycine (Gly, G) - ✔✔smallest amino acid, R group = Hydrogen, achiral
Alanine (Ala, A) - ✔✔aliphatic side chains
Valine (Val, V) - ✔✔aliphatic side chains
Leucine (Leu, L) - ✔✔aliphatic side chains
Isoleucine (Ile, I) - ✔✔aliphatic side chains, has 2nd stereocenter
Proline (Pro, P) - ✔✔alpha"amino" group, 2* amine, cyclization makes P rigid, limits
protein conformation
Aromatic Amino Acids - ✔✔Tyrosine (Y), Phenylalanine (F), & Tryptophan (W)
