MCAT official prep online practice questions Flashcards
In a fischer projection when the priority of the groups is counterclockwise it is a ___ formation
Counterclockwise is S
In a fischer projection when the priority of the groups is clockwise it is a ___ formation
Clockwise is R
What is the configuration of naturally occurring aspartic acid?
Naturally occurring aspartic acid has an L configuration
What letters apply to the configurations of double bonds?
Z and E
What is the side chain of valine?
- CH(CH3)2
What is the three letter symbol of aspartic acid?
Asp
What is the three letter symbol of valine?
Val
What is the side chain of phenylalanine?
-C6H5
What is the three letter symbol of phenylalanine?
Phe
What is the three letter symbol of Lysine?
Lys
What is the side chain of lysine?
-(CH2)4NH2
If Keq is equal to 1 what is delta G equal to?
If Keq is equal to 1 then delta G is equal to 0 (so no ATP is required or produced during the reaction)
Oxaloacetate is an example of what kind of molecule?
Alpha-keto acid
What is the wavelength range for visible light?
400-750 nm
The wavelength of 226 nm corresponds with what wave on the electromagnetic spectrum?
Ultraviolet waves
The wavelength of 1.26 μm corresponds with what wave on the electromagnetic spectrum?
Infrared radiation
The wavelength of 3.17 μm corresponds with what wave on the electromagnetic spectrum?
Infrared radiation
Formula for work by an elastic force
W = Fx/2 work = (force x distance) / 2
Pico is 10?
Pico is 10-12
Nano is 10?
Nano is 10-9
Micro is 10?
Micro is 10-6
Power related to speed and force?
Power = force x velocity
P = F x v
Membrane symport is ______
Lipophilic - because membranes have polar and nonpolar components
Which is smaller Na+ or K+?
Na+ is smaller than K+
If a catalyst is saturated with a substrate, how will increasing the concentration of the substrate affect the rate of the reaction?
Increasing the substrate when the catalyst is already saturated will have no effect on the rate of the reaction
Do hydrophilic or hydrophobic molecules cross the cell membrane?
The hydrophobic core of the membrane prevents the diffusion of hydrophilic molecules (such as ions and polar molecules) across the membrane. Hydrophobic molecules can easily cross the membrane
What happens to the pH as a result of the removal of a weak base?
There is a decrease in pH due to a decrease in the amount of OH- in solution
What is beta decay?
Beta decay is the decay in which a beta particle (an electron or positron) is emitted from a heavy atom nucleus
What happens during alpha decay?
During alpha decay, alpha particles (helium nuclei) are emitted from an atom
What happens during gamma absorption?
During gamma absorption, the absorption of gamma rays consists of the process in which high energy photons are absorbed by target atoms
The speed of transverse waves is directly proportional to?
The propogation speed of transverse waves is directly proportional to the tension applied along the cord
What is the formula for the fundamental frequency of a vibrating string?
f = v / 2L
Frequency = velocity / 2x length
What is the idea of saturation kinetics?
For an enzymatically catalized process, the reaction rate will level off with the increasing concentration of the substrate - this is because the enzyme becomes a bottleneck for the reaction.
Does the dissociation of the myosin head from the actin filament require ATP?
Yes: Dissociation of the myosin head from the actin filament requires the binding of ATP
Does the attachment of the myosin head to the actin filament require ATP?
NO: The attachment of the myosin head to the actin filament requires calcium and a triponin/tropomyosin shift
Does the conformational change that moves actin and myosin filaments relative to one another require ATP?
Yes: The conformational changes that move actin and myosin relative to one another require that ATP be hydrolyzed - The conformational change occurs when the products of hydrolysis (ADP and Pi) are released
