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Biochemistry - Block 1 > Biochem Lecture 1 > Flashcards

Biochem Lecture 1 Flashcards

1
Q

Weak Acid Dissociation Equation

A

HA↔H ᐩ+ A﹣

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2
Q

Buffer

A

Weak Acid ↔️ Hᐩ + Conjugate Base

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3
Q

Keq

A

The equilibrium constant for a reversible chemical rxn. It depicts the concentration
When equilibrium is reached and which direction is favored.

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4
Q

Keq Formula.

Products and Reactants are located where in the formula? Denominator and Numerator.

A 
   	  [ H A ]
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5
Q

↑ Keq

A

Strong Acid

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6
Q

↓ Keq

A

Weak Acid

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7
Q

products > reactants, what would be the Keq in reference to 1?

A

Keq> 1

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8
Q

When Keq>1, which direction is favored? and whats the relationship between products to reactants?

A

Products > reactants, Reverse direction is favored.

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9
Q

Products < 1, what would be the Keq in reference to 1?

A

Keq <1

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10
Q

Keq <1, which direction is favored? What the relationship between products to reactants?

A

The forward direction is favored. Products < Reactants.

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11
Q

What is pK in reference to Keq?

A

it’s the log inverse of Keq

pk = - log ( Keq)

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12
Q

↓pk

A

Strong Acid

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13
Q

↑pk

A

Weak Acid

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14
Q

What is the best buffering range?

A

When pH = Pk,

Base = Acid

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15
Q

How to find pH if given H+?

A

pH = - log [ H+ ]

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16
Q

How to find pOH?

A

pOH= -log [OH-]

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17
Q

What is physiological pH?

A

7.35-7.45

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18
Q

Acid Bicarbonate buffer

A

CO2 + H20 — H2CO3—HCO3 + H

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19
Q

High CO2, will result in a what kind of pH?

A

Low pH due to ↑ H +

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20
Q

Low HCO3-, will result in what kind of pH?

A

Low pH due to free roaming ↑ H +

21
Q

How to find the PI of a Neutral Amino Acid?

A 
                   2
22
Q

How to find the PI of a Acidic Amino Acid

A 
                   2
23
Q

How to find the PI of a Basic Amino Acid?

A 
                 2
24
Q

PI> pH

A

Positive charge

25
Q

PI< pH

A

Negative

26
Q

Henderson-hasselbalch equation

A

Relationship between pH of a solution and relative amounts of
individual conjugate base and acid pairs
pH=pk+log [Conjugate Base] /// [Conjugate acid]

27
Q

Log (1) =

A

0

28
Q

Log (10)

A

1

29
Q

Log (100)

A

2

30
Q

Log (1000)

A

3

31
Q

Hydrophilic AA traits

A

Acidic, Basic, Polar

32
Q

Name the Hydrophilic AA

A

Aspartate, Glutamate, Lysine, Arginine, Histidine,

Serine, Threonine, Cysteine, Tyrosine, Asparaginine, Gluatamine

33
Q

Basic/ polar AA

A

Lysine, Arginine, Histidine
K, R, H
Lys, Arg, His

34
Q

Acidic/polar AA

A

Glutamate Glu, E

Aspartate Asp, D

35
Q

Polar AA

A 
Serine S, Ser
Threonine, Thr, T
Cysteine, Cys, C
Asparganine, Asn, N
Glutamine, Gln, Q
Tyrosine, Tyr, Y
36
Q

Hydrophobic/ Nonpolar AA

A 
Alanine, Ala
Glycine, Gly
Valine, Val
Isoleucine, lle, I
Leucine, Leu, L
Phenylalanine, Phe, F
Tryptophan, Trp, W
Methionine Met, M
Proline, Pro, P
37
Q

Unique AA

A

Glycine, Gly, G

Proline, Pro, P

38
Q

Sulfur containing AA

A

Cysteine, Cys, C

Methionine, Met, M

39
Q

How many codons are there?

A

64

40
Q

Start Codon

A

AUG which is encoded by a Met.

41
Q

Stop Codon

A

UAA
UAG
UGA

42
Q

Stop Codon UAG, encodes for which rare AA?

A

Pyrrolysine.. Remember : U ARE GREAT, PERIOD.

43
Q

Stop Codon UGA, encodes for which rare AA?

A

Selenocysteine.. Remember:

U GET ANOTHER Selena!

44
Q

How are peptide bonds made? What is released?

A

Carboxyl group on one amino acid combine with the Amino group on another amino acid. H20 is released.

45
Q

Amino Acid in a basic solution will

A

give it’s + from NH3+—-> resulting in a NEGATIVE charged AA

46
Q

Amino Acid in a acidic solution will

A

accept a H+ proton to its COO- –> resulting in a POSITIVE AA.

47
Q

pH < Pka

A

COOH (protonated)

48
Q

pH> Pka

A

COO- (deprotonated)

Biochemistry - Block 1 (6 decks)

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