bio 232 final purdue

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addition of thiol compounds to buffers

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38 Terms

1

addition of thiol compounds to buffers

such as 2-mercaptoethanol - ADDED TO PROTECT PROTEINS FROM OXIDATION

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2

chelating agents in buffers

protects enzymes from inactivation by heavy metal ions (such as EDTA)

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3

addition of cations to buffers

help maintain ionic strength

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4

addition of substrates to buffers

help stabilize enzymes

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5

Protease inhibitors

helps suppress endogenous proteases

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6

cell cycle checkpoints

G1 --> rest or divide
S --> is the DNA ok?
G2 --> Is the cell fully equipped?
M --> are sister chromatids fully separated and duplicated correctly?

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7

what are cell cycle regulators

proteins that maintain and regulate cell cycle checkpoints

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8

after a series of ten-fold dilutions, what will be the dilution of the final tube?

final dilution is 10^-7
dilution factor is 10^7

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9

catabolism

breakdown of molecules to form simpler ones with the release of energy (oxidative process)

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10

products of photosythesis and inputs of cellular respiration

sugars an oxygen

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11

inputs of photosynthesis and products of cellular respiration

carbon dioxide and water

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12

how can we calculate moles of CO2

liberation of CO2
consumption of O2

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13

formula for calculation cell density

(total # of cells / # of squares) <b> dilution factor </b> volume factor = cells/mL

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14

pigement

molecule that absorbs and reflects light

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15

what are other pigments that we did not focus on in lab

carotenoids
anthocyanis
xantophylls

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16

common solvents for chlorophyll and pigment extraction

acetone
ethanol
methanol
diethyl ether

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17

Plasmid characteristics

small and circular DNA, extra chromosomal DNA, usually presents multiple copies in the cell, inherited and replicates

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18

three main components for all plasmid vectors

1) origin of replication
2) heat shock/chemical transformation
3)recovery

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19

competency

ability of bacteria to take up foreign DNA into cells

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20

steps to DNA extraction

1) cell harvest + resuspension

2) cell lysis

3) neutralization buffer to remove cellular debris and separate plasmid DNA

4) DNA precipitation

5)DNA wash w ethanol to DE SALT DNA

6) rehydrate DNA

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21

what foes the A260/A280 ratio signify - what is considered good

ratio of protein concentration

ratio for a pure extraction =
A260/A280 > 1.8

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22

Bradford Assay

spectroscopic analytical procedure used to measure the concentration of protein in a solution

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23

Protein extraction steps

1) Lysis
2) Centrifugation
3) Analysis
4) Dilution

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24

two main components of any chromatography

mobile and stationary phase

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25

what happens in mobile phase

This phase is made up of solventsā€¢

It acts as a solvent-sample mixture that can be introduced in the column.ā€¢

It acts as a developing agent - helps in the separation of components in the sample to form bands.

ā€¢ It acts as an eluting agent - the components that are separated during the experiment are removed from the column

ā€¢ Some examples of mobile phase- are ethanol, acetone, and water.

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26

what is the stationary phase

solid material w good absorption

* allows free flow of the mobile phase

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27

in SEC what does the buffer do for the column?

allows mixture to travel through the column

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28

how does SEC (size exclusion chromotagrpahy work)

* large molecules are luted first in the void volume

* small molecules are eluted in the total volume

* solutes within the separation range of the matrix are fractionally excluded

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29

why is Triton - X used for protein isolation

helps soluble the membrane

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30

extraction buffer components

thiol compounds
chelating agents
cations
substrates
protease inhibitors

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31

thiol compounds

2-mercaptoethanol
- are frequently added to proteins to protect them from oxidation

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32

Chelating agents

EDTA - protects enzymes from inactivation by heavy metal ions

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33

cations

frequently added to maintain ionic strength (Mg+2)

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34

substrates

added to stabilize enzymes and are therefore quite specific

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35

protease inhibitors

supression of endogenous proteases

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36

Osmotically active solutes

solutes that maintain tonicity of the solution comparable to that of the cell or tissue - acids swelling (SUCH AS GLYCEROL)

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37

Detergents

often added to soluble organelles or membrane associated proteins

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38

what macromolecules can ELISA quantify

antigens, antibodies, proteins and glycoproteins

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