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Chemical and Physical Foundations of Biological Systems Questions with Correct Answers
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Chemical and Physical Foundations of Biological Systems Questions with Correct Answers
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Chemical and Physical Foundations of BiologicalSystems Questions with Correct Answers
(k = 8.988 x 109 N-m 2/C 2) Correct Answer-where k is Coulomb's
constant
(e = 1.6 X 10~19 C) Correct Answer-The smallest possible unit
of charge is one electron unit
An electric field is defined as the electrostatic force per unit charge. The
symbol for any
electric field is E and is vector and have units of N /C
or V/m Correct Answer-what is E
E=kq/r^2 Correct Answer-For a point charge, the electric field is found
by dividing Coulomb's law by q,
giving:
F=qE Correct Answer-the force on a charge (q) in an electric field (E) is
u=qEd Correct Answer-the potential energy (LJ) of a charge in an
electric field
V=Ed Correct Answer-Voltage ( V) is the potential for work by an
electric field in moving any charge from one point to another.
,a chemical process that introduces a hydroxyl group (-OH) Correct
Answer-hydrolation
In organic chemistry, redox reactions look a little different. Electrons in
an organic redox reaction often are transferred in the form of a hydride
ion - a proton and two electrons. Correct Answer-Oxidation and
reduction
carboxylic acid group is produced by treating a substrate with carbon
dioxide
Carboxylic acid added next to the oh- Correct Answer-carboxlation
Velocity of ions depends on the ion mass-to-charge ratio fastest ions are
those with smallest m/z ratio Correct Answer-Which experimental
feature of the MALDI-MS technique allows the separation of ions
formed after the adduction of tissue molecules?
when one of the answers divided by 2 it must equal one of the answers
with the same power Correct Answer-Which laser is suitable for the
MALDI technique after its frequency is doubled?
Hydrolysis
,this is because the passage talks about proteolytic cleavage which is
hydrolysis Correct Answer-Proteins can be "fingerprinted" using
MALDI if they are subjected to proteolytic cleavage before analysis.
During protein fingerprinting, what reaction occurs to prepare the
sample for analysis?
radiation frequency
E=hv
h=planks constant
v=radiation frequecny Correct Answer-photon energy is directly
proportional to
1/f=1/do+1/di
1/f = 1/o + 1/i = 1/12 + 1/4 = 1/12 + 3/12 = 4/12. Thus, f = 12/4 = 3 cm.
Correct Answer-thin lens equation
Based on the ray diagram and distances shown in Figure 1, the focal
length of the lens is:
have a higher frequency than laser type C.
because the photon energy must be larger than the bond energy in order
to break the bond. Because the photon energy is directly proportional to
the radiation frequency, laser type A must have a higher frequency than
, laser type C. Correct Answer-According to the passage and the data in
Table I, what feature must distinguish laser type A from laser type C in
order to be suitable for the cleavage of the bonds specified? Laser type A
must:
Laser A has a higher enthalpy then Laser C
kinetic energy of a photoelectron is equal to hf - 3.4 eV = 20.5 eV - 3.4
eV = 17.1 eV.
E=hf-w Correct Answer-What is the kinetic energy of a photoelectron
produced in the energy meter of the PAC device when the frequency of
an incident photon that is NOT absorbed in the solution is f = 5.0 × 1015
Hz?
alcohol produces the most stable carbocation (tertiary) and consequently
will most easily lose a water molecule upon protonation of the hydroxyl
group in acidic media.
SN1, that's favored by a tertiary carbon or a secondary carbon, is going
to be favored by SN1. Whereas a methyl carbon or a primary carbon,
that's going to probably go SN2. Correct Answer-Which alcohol will
most likely undergo substitution by an SN1 mechanism in acidic
conditions?
Add 0.1 M NaOH(aq) to quench unreacted anhydride. Then add diethyl
ether and separate the layers. The amide can be obtained from the ether
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