1. Fundamentals of Biochemical Reactions Flashcards Preview

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Flashcards in 1. Fundamentals of Biochemical Reactions Deck (36):
1

What is the free energy equation? (dletaG =...)

ΔG = ΔG°΄ + RTln(Products / Reactants)

2

Keq = ?

Products over Reactants

3

deltaG of ATP -> ADP + Pi

-7.3 kcal / mol

4

deltaG of ATP -> AMP +PPi

-10.9 kcal / mol

5

deltaG of PPi -> Pi + Pi

-4.0 kcal / mol

6

Normal pH of blood?

pH = 7.37 - 7.43

7

Kidneys remove H+ from the blood in the form of ____, and reabsorb _____

H+ removed as NH4+ HCO3- is reabsorbed

8

What are the 6 enzyme classes?

  1. Oxidoreductases
  2. Trasferases
  3. Isomerases
  4. Lyases
  5. Ligases
  6. Hydrolases

9

What do Lyases do?

Add or remove atoms to or from a double bond.

10

What do Lygases do?

Form C-O, C-S, C-N, or C-C bonds with the hydrolysis of ATP

11

Metal ions that act as cofactors (5)

  1. Copper (Cu)
  2. Iron (Fe)
  3. Magnesium (Mg)
  4. Selenium (Se)
  5. Zinc (Zn)

12

Optimal temperature for most human enzymes

37 degrees celcius

13

Optimal pH for most human enzymes (range, excludes pepsin)

pH between 4-8

14

Proton pump inhibitors affect what enzyme?

H+/K+ ATPase

15

Where is H+/K+ ATPase found, and what is its function?

Found in the Parietal Cells lining the gastric lumen

Pumps H+ into the lumen where it combines with Cl- to become HCL

16

What disease of the stomach can omeprazole cause, and what are its symptoms?

Hypochlorhydria

Symptoms:

  • Reduced absorbtion of nutrients
  • Increased sensitivity to food poisioning
  • Reduction of gastric enzyme efficiency (especially pepsin, gastric amylase, and gastric lipase​)​​

17

Binding of Noncompetitive vs Uncompetetive inhibitors

Noncompetetive:

Binds to either the empty Enzyme or the Enzyme-Substrate complex at a site other than the substrate binding site

Uncompetitive:

Binds to only the Enzyme-Substrate complex at a site other than the binding site.

18

In conceptual terms, what does Km represent?

The amount of substrate, in moles, needed to reach 1/2 Vmax

19

Characteristics of Competitive inhibition

  • No Effect on Vmax
  • Increase in Km
  • Larger substrate concentration needed to achieve 1/2 Vmax

A image thumb
20

Characteristics of Noncompetitive inhibition

  • Decrease in Vmax
  • Km stays the same (the arch moves down)
  • Inhibitor effects cannot be overcome by increasing substrate concentration. (Vmax is lowered)

A image thumb
21

Characteristics of Uncompetitive inhibition

  •  Km and Vmax are decreased by the same factor, resulting in paralel LB graphs

A image thumb
22

What is the example given in the slides of a chelating agent?

EDTA: Ethylene Diamine Tetraacetic Acid

A image thumb
23

Symptoms of lead poisioning?

  • Irritability
  • Sideroblastic Anemia
  • Abdominal pain
  • Headaches

24

What two medications are given for lead poisoning?

How do these work?

1. Ca-EDTA

2. Dimercoprol

Lead likes EDTA more than Calcium does, so it binds preferetially to the EDTA and forms Pb-EDTA, which is excreted out of the body.

Dimercoprol attaches to the regions of enzymes affected by lead that lead would like to attach to - thus slowing the effects of lead toxicity.

25

Enzyme Inactivation resembles which type of inhibiiton?

Noncompetitive

Vmax decreases, but Km stays the same.

(There are less enzymes to do the reaction quickly, but affinity stays the same)

26

What are the four enzymatic markers for MI?

  1. Troponin (Specifically cTn-I)
  2. CK-MB (Muscle Brain Creatine Kinase)
  3. LDH-1 (Lactate Dehydrogenase)
  4. AST/SGOT1 (Aspartate aminotransferase / Serum Glutamate oxaloacetate transaminase)

* Note: These are presented in order from quickest to present to longest to present.

27

When is Troponin the most sensitive for an MI?

10-24 hours following MI

28

Enzyme related to the diagnosis of Bone Disease

Alkaline phosphatase

The reality is a bit more complex than this, but this enzyme is present in bone, and is freed when there is damage. This enzyme is also a marker for liver disease.

 

29

Enzymes related to the diagnosis of Obstructive Liver Disease

Sobitol Dehydrogenase

Lactate Dehydrogenase (LDH - 5)

30

Enzyme related to the diagnosis of Prostatic Cancer

Acid Phosphatase

31

Enzyme related to the diagnosis of Acute pancreatitis

Amylase / Lipase

32

Enzymes related to the diagnosis of Muscular Distrophy

Aldolase

Helps convert glucose into energy in muscle cells

ASH

(I have no idea what this is)

33

Enzyme related to the diagnosis of Liver Disorder

CK-MM

Creatine Kinase - Muscle

WITH ALSO HAVING HIGH

ALT AST

34

What is the graph shape for Michaelis Menton graphs?

Hyperbolic

35

What is the graph shape for Allosteric enzyme kinetics?

Sigmoidal

36