CHEM/PHYS

Question 1

if q says that one enzyme does a peptide bond hydrolysis where does next site attach

Answer 1

NH2 - amide bond - this was with aromatic residues

Question 2

if fluroscent at 400nm and excitation at 360 nm, then what is energy?

Answer 2

answer would be h X c / excited - emitted

Question 3

1 Nm equals = um

Answer 3

0.001 um

Question 4

in reaction 1 the compound(substrate) mixed with O2 will undergo oxidation of hydroxul group attach phenol (turns to double bond) so what is pattern

Answer 4

hydroxy groups turn to carbonyl groups (double bond now)

Question 5

for kcat what is formula and what is vmax aslo

Answer 5

vmax/E - vmax is also the rate

Question 6

absorption of UV light by organic molecules always results in what process

Answer 6

excitation of bound electrons IT MAY RESULTS IT: bond breaking, ejection of electrons (10-124nm)

Question 7

vibration of atoms in polar bonds happens by absorbing what

Answer 7

frequencies of infrared radiation (IR spectroscopy) not UV

Question 8

what is more polar (OH, ketones, aldehydes) order (ACAK/AAEEA)

Answer 8

Amide > Carboxylic Acid > Alcohol > Ketone > Aldehyde > Amine > Ester > Ether > Alkane.

Question 9

ketone or aldehyde which is more polar

Answer 9

ketone

Question 10

the half life of radioactive material is

Answer 10

time it takes half of all the radioactive nuclei to decay into DAUGHTER NUCLEI (DOESNT NEED (MAY BE) TO BE RADIOACTIVE)

Question 11

a person is sitting on chair, why must they need to lean forward or slide their feet

Answer 11

adjust to account for center of mass, keep body in equilibrium - NOT to inc force standing up (makes harder), also the energy required to stand is FIXED

Question 12

tertiary structure is aka

Answer 12

full folded protein

Question 13

when they say electronic excited state that is closer in energy to the ground state it means

Answer 13

lowest energy (large wavelenghth)

Question 14

With ATP label each phosphate

Answer 14

a,b, y (last one) - gets cleaved alpha phosphate is the one attached to the ribose sugar

Question 15

structure of ATP

Question 16

phosphorylated Thr could be mimicked by what

Answer 16

glutamate - same negative charge

Question 17

what phenomonen causes static air to be dran into the mask when oxygen flows

Answer 17

venturi effect

Question 18

the venturi effect is the _____ in fluid pressure when a fluid passes through a ____ section

Answer 18

reduction, constricted

Question 19

if we have more GC bonds why would we expect a higher melting point

Answer 19

increased pi stacking strength

Question 20

which property of a substance is used to estimate its relative vapor pressure

Answer 20

boiling point

Question 21

there is ___ relation bw vapor pressure and bp, so low bp then ___ vp

Answer 21

inverse, so high

Question 22

molecules with identical molecular weight have ___ vapor pressures

Answer 22

different, its possible bs different arrangement/forces

Question 23

molecules with lower dipole tend to have _____

Answer 23

higher vapor, but need to account for MW as well

Question 24

name: 2 fatty acids ester linked to single glycerol and charged head group

Answer 24

phospholipid - membrane

Question 25

name: 3 FA ester linked to a single glycerol

Answer 25

storage lipids - neutral - triacylglycerol

Question 26

name: 2 FA ester linked in single sphingomine and charged head group

Answer 26

sphingomyelin inslutor in myelin sheath of axons

Question 27

name: 3 FA ester linked to single spingosine

Answer 27

spingolipid - ceramide - involved with cell signaling

Question 28

to determine if equation is spontaneous use this equation too

Answer 28

G=-RTlnK where k is formation constant/constant, and T is temperature

Question 29

what best describes the bond between copper and nitrogen atoms

Answer 29

coordinate covalent -- nitrigen donates electrons pair

Question 30

if we have NH3 in reactants then add HCl what would it cause equilibrium

Answer 30

move left, because it will inc reaction rate, so faster to the right, then there will be a dec in reactants, so move left

Question 31

this is the number to indicate the number of atoms, molecules or ions bonded to central atom

Answer 31

coordination number

Question 32

ammonia is more __ and water is ___and ammonic can/not donate a electrons more readily

Answer 32

basic, and amphoteric, CAN

Question 33

what is the ph of buffer solution that is 0.2M HCO3- and 2 M H2CO3 with the first pka of carbonic acid being 6.37

Answer 33

so firsy, we know we have more acid, so will be acidic, then see the differen in 10s between 0.2 and 2 M = 1 10, so minus 1 from pka

Question 34

blood pressure - is

Answer 34

sys/dia 120/80

Question 35

systole is when the heart

Answer 35

contracts - where the blood vessels will exceed the pressure in the cuff

Question 36

in dna double helix the sugar phosphate backbones form the int/ext of the double helix

Answer 36

EXTERIOR

Question 37

With the action of rubbing silk on the glass rod you are

Answer 37

removing electrons - not possible to add protons in this rubbing

Question 38

the strength of the bond is ___ to bond energy

Answer 38

direct porp

Question 39

if i have large bond energy the length will be

Answer 39

short

Question 40

hess law for /_\H

Answer 40

H products -- sum of H reactants

Question 41

formula for Power can be

Answer 41

PE/time = mgh/time **can caclcualte the height with the number of steps and height of the steps

Question 42

1 J equals

Answer 42

1 Nxm

Question 43

formula for work done on elastic obj

Answer 43

1/2kx^2

Question 44

negative focal length means (what lens)

Answer 44

diverging

Question 45

once we have focal length and object distance plug in formula to solve for i which can be used in what equation

Answer 45

m=-i/o to tell magnificantion (reduced or bigger)

Question 46

what are the energy conversion for battery powered resistive circuit

Answer 46

chemical - electric - thermal

Question 47

protein secondary structure is characterized by pattern of H bonds bw

Answer 47

backbone amide protons and carbonyl oxygens

Question 48

for acid base indicator you want to choose one thats

Answer 48

same near th eequivalence point - also indicators are weak

Question 49

____ is the range over which the indicator will change colour

Answer 49

endpoint

Question 50

for methyl orange what colour for acid/base

Answer 50

orange, yello

Question 51

for bromo blue colour for acid/base

Answer 51

yellow, blue

Question 52

for phenolpthalein what colours

Answer 52

colourless, pink

Question 53

for NMR, what do the signals mean

Answer 53

it related to the number of hydrogens, symettry (refers to the # of groups of distinct hydrogens)

Question 54

for NMR with cyclic what lines of symmetry

Answer 54

hori and vert

Question 55

for NMR if theres no line of symmetry then all Hs are

Answer 55

unique

Question 56

for NMR with splits what does it mean and the formula

Answer 56

its refers to the number of spike - n+1 where n is the number of adjacent HYDROGENS

Question 57

For NMR, integration refers to

Answer 57

how tall the spike is - refers to how many of the uniqure hydrogen there are (5 vs 4 vs 3 H's in each group)

Question 58

for NMR shifts refer to

Answer 58

how far it is way from 0 (TMS)

Question 59

in NMR shift are based on what

Answer 59

EN atoms, and unsaturated groups

Question 60

in NMR if hydrogens are close to the Cl then they are

Answer 60

downfield (left) (greater EN)

Question 61

in NMR downfield where we find

Answer 61

EN atoms or unsat (deshielding)

Question 62

say the order of the NMR from down to up

Answer 62

carboxy, aldehyde, aromatic, OH, halides, alkenes, alkanes