CHEM/PHYS

Question 1

All amino acids are S except for

Answer 1

cysteine which is R

Question 2

All amino acids are L except

Answer 2

Glycine

Question 3

_________appear in the cell wall of bacteria which allows it to resist cleavage from our peptidases.

Answer 3

D-amino acids

Question 4

Lysine gets Ubiquinated

Question 5

______is the precursor to the catecholamines eg. the neurotransmitters dopamine, epinephrine (adrenaline), norepinephrine.

Answer 5

Tyrosine - amine hormones

Question 6

______is the precursor to seretonin and melatonin. These are the indolamines

Answer 6

Tryptophan

Question 7

what is indole group and ex

Answer 7

tryptophan, 2 ring 1 6 and 1 5 - 5 one has NH

Question 8

Ketogenic only:

Ketogenic AND Glucogenic:

Glucogenic only: The remaining 13

Answer 8

Leucine & Lysine

Phenylalanine, Isoleucine, Threonine, Tyrosine, Tryptophan (FWY,IT)

Question 9

Isoleucine is ____branched, leucine is _____branched

Answer 9

BETA, AND GAMMA

Question 10

this principle states that when separate atoms or particles are cooled to absolute zero they consolidate into single quantum entitiy

Answer 10

bose - einstein

Question 11

Absolute zero occurs at a temperature of , or -273.15 degrees Celsius, or at -460 degrees Fahrenheit.

Answer 11

0K

Question 12

for le chatalier if you have inc temperature what rx favour

Answer 12

endothermic

Question 13

for le chatalier if you have low temperature what will it favour

Answer 13

exothermic

Question 14

if you have inc pressure in le chatalier then it will favour what side

Answer 14

side with fewer molec

Question 15

this prinicple states that no 2 electrons share the same set of quantum numbers

Answer 15

pauli exclusion

Question 16

when an electronegative atom is added (N) that will do what to water solubility

Answer 16

inc it/inc polarity - N WILL HAVE A LONE PAIR OF E-

Question 17

the dissociation constant (Ki) will/not change because its a

Answer 17

constant - will not change

Question 18

ubiquinone is what kind of functional group and reduced to ____ which is what funciton group

Answer 18

starts as ketone, then reduced to ubiquinol which has a alcohol group attached to it

Question 19

structure of flavin

Answer 19

3 rings fused, 4 n total, and 2 c=o

Question 20

coupling the movement of a charged particle against a concentration gradient will cause it to become

Answer 20

less exothermic - moving against gradient is energetically costly, by coupling the exergonic, and endergonic, overall process less exothermic - more middle, less heat that when it was uncatalyzied as in the passage

Question 21

how does pressure compare if at the same depth what is the comparison in pressure

Answer 21

same pressure - use p=pgdepth – since the densities and gravities are the same depth too then it will be the same

Question 22

how to find neutorns

Answer 22

mass number – protons

Question 23

doubling the absolute temperature, and the doubling the gas molecules cause what for the volume

Answer 23

double the volume

Question 24

structure of pyrrole is

Answer 24

5 member aromatic ring that has 1 nitrogen atom - pi bond - heterocyclic aromatic compound

Question 25

1000 cm 3 is equal to

Answer 25

1 L

Question 26

energy of the absorbed radiation must be larger than the energy of the flu radiation

Answer 26

explain in freq terms

Question 27

which carbon in most a.a are chiral

Answer 27

alpha is chiral , beta is usually not

Question 28

when the gel depict molecular weights are increasing rather than dec its called

Answer 28

aggregration (opp way)

Question 29

As time increases the reducing conditions also increase, causing the quaternary protein to be

Answer 29

broken down into smaller and smaller subunits. - will see it diminish on gel

Question 30

when it asks for the net change in the MW of enzyme need to look at

Answer 30

type of enzyme ex. methyl transferase - not net change is just tranfering it (can calculate the mass - of methyl CH3)

Question 31

_____ facilitate the mixture of hydrophobic and hydrophilic compoiunds

Answer 31

detergents

Question 32

the presence of reducing sugar makes the compound susceptible to

Answer 32

oxidation

Question 33

same MW measures the _____ of the primary structure - folding status does not affect it

Answer 33

stability

Question 34

if the Kd is unchanged afte rpurification this would suggest that the protein has

Answer 34

not been denatured - same affinity - ex where it would indiacte that it was still in the native state

Question 35

why are such high tempeartures required for fusion

Answer 35

allow reactants to approach within range of the strong nuclear force - (the force that holds nuclei together)

Question 36

the prob of fusion increase with ____ in the distance bw fuel particles that allow for attractive nuclear forces to overcome repelling nuclear forces acting on medium and long distance

Answer 36

decrease

Question 37

enantiomers have the same _____ but different

Answer 37

chem and phys properties, different 3d shape, SMELL - bc of interact differently with chiral odorant receptors

Question 38

the IR spectrum of enantiomenrs are identical bc

Answer 38

same compounds - with normal light, circulary polarized light will may give diffferences

Question 39

the word selectivity is saying to look for residue/a.a that can be modified withouth the other residues being modified

Question 40

the a.a. or like compound was adjusted and theres a new modifacation where to look for it

Answer 40

look at the diagram, where add carboxy group - now acidic

Question 41

pyrrole found in

Answer 41

heme

Question 42

acetate ion known as

Answer 42

CH3CO2 - 2 C

Question 43

NH4HCO3 this is

Answer 43

ammonium bicarbonate

Question 44

(NH4)2CO3 this is

Answer 44

ammoinium carbonate

Question 45

NH4HCO2 is

Answer 45

ammonium formate

Question 46

when asked what if the pressue or gas with eqaution: if 1 atm of 4CO --> C302 + CO2 what is the final pressure

Answer 46

use PV=NRT - so total on the left is 4 moles, then produces 2 moles, for halfed, no since the n is halved then pressure is also halved =0.5

Question 47

is something is lipophilic that means its

Answer 47

not water soluble - lipids - so it will go into the tery butyl ether layer - not aq

Question 48

Ki is the concentration of the inhibitor that gives the rx rate of half max rx rate - so on graph of enzyme activty vs concentration where to find Ki

Answer 48

midpoint 0 inflection point in mid

Question 49

_____ attractive force consisting of a combo of H bonding and ionic bonding

Answer 49

salt bridge (+/-)

Question 50

pi stacking is the attractive noncovalent pi interactions that occur with overlap of pi bonds of AROMATIC RINGS EX

Answer 50

Y

Question 51

which group will be deprot first - as pH of solution is raised

Answer 51

most acidic group will deprot first - hydroxyl least, then prot amine, then carboxy group - if theres more EN atoms (Cl-) then it will be more acidic

Question 52

to find the acceraltion of the masses with no numbers when connected by massless cord suspended over massless and frictionless pulley

Answer 52

use F=am, Fnet: F1-F2, m1g - m2g also mT=m1 + m2 sub in with massess

Question 53

The ______is the quantity of heat necessary to change 1 g of a solid to a liquid with no temperature change

Answer 53

heat of fusion

Question 54

specfic heat of water looks at

Answer 54

energy needed to raise the temp of 1 g of water (liq) by one degree - 4.18

Question 55

heat of vaporization looks at

Answer 55

amount of energy required to convert liquid water to steam

Question 56

capacitance is directly porprortional to the

Answer 56

area of the parallel plates, permittivity (dielectric), and the voltage supply

Question 57

capacitance is inverse propr

Answer 57

to the separation betwee the parallel plates, if want to inc charge on capacitor then dec separation bw parallel plates

Question 58

what is the value of Kb for the conj base if weak organic acid that has pKa of 5

Answer 58

pkb + pka = 14, so when minus Pkb is 9, then do 10^-9