MCAT official prep online practice questions

Question 1

In a fischer projection when the priority of the groups is counterclockwise it is a ___ formation

Answer 1

Counterclockwise is S

Question 2

In a fischer projection when the priority of the groups is clockwise it is a ___ formation

Answer 2

Clockwise is R

Question 3

What is the configuration of naturally occurring aspartic acid?

Answer 3

Naturally occurring aspartic acid has an L configuration

Question 4

What letters apply to the configurations of double bonds?

Answer 4

Z and E

Question 5

What is the side chain of valine?

Answer 5

• CH(CH3)2

Question 6

What is the three letter symbol of aspartic acid?

Answer 6

Asp

Question 7

What is the three letter symbol of valine?

Answer 7

Val

Question 8

What is the side chain of phenylalanine?

Answer 8

-C6H5

Question 9

What is the three letter symbol of phenylalanine?

Answer 9

Phe

Question 10

What is the three letter symbol of Lysine?

Answer 10

Lys

Question 11

What is the side chain of lysine?

Answer 11

-(CH2)4NH2

Question 12

If Keq is equal to 1 what is delta G equal to?

Answer 12

If Keq is equal to 1 then delta G is equal to 0 (so no ATP is required or produced during the reaction)

Question 13

Oxaloacetate is an example of what kind of molecule?

Answer 13

Alpha-keto acid

Question 14

What is the wavelength range for visible light?

Answer 14

400-750 nm

Question 15

The wavelength of 226 nm corresponds with what wave on the electromagnetic spectrum?

Answer 15

Ultraviolet waves

Question 16

The wavelength of 1.26 μm corresponds with what wave on the electromagnetic spectrum?

Answer 16

Infrared radiation

Question 17

The wavelength of 3.17 μm corresponds with what wave on the electromagnetic spectrum?

Answer 17

Infrared radiation

Question 18

Formula for work by an elastic force

Answer 18

W = Fx/2 work = (force x distance) / 2

Question 19

Pico is 10^?

Answer 19

Pico is 10^-12

Question 20

Nano is 10^?

Answer 20

Nano is 10^-9

Question 21

Micro is 10^?

Answer 21

Micro is 10^-6

Question 22

Power related to speed and force?

Answer 22

Power = force x velocity

P = F x v

Question 23

Membrane symport is ______

Answer 23

Lipophilic - because membranes have polar and nonpolar components

Question 24

Which is smaller Na+ or K+?

Answer 24

Na+ is smaller than K+

Question 25

If a catalyst is saturated with a substrate, how will increasing the concentration of the substrate affect the rate of the reaction?

Answer 25

Increasing the substrate when the catalyst is already saturated will have no effect on the rate of the reaction

Question 26

Do hydrophilic or hydrophobic molecules cross the cell membrane?

Answer 26

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

Question 27

What happens to the pH as a result of the removal of a weak base?

Answer 27

There is a decrease in pH due to a decrease in the amount of OH- in solution

Question 28

What is beta decay?

Answer 28

Beta decay is the decay in which a beta particle (an electron or positron) is emitted from a heavy atom nucleus

Question 29

What happens during alpha decay?

Answer 29

During alpha decay, alpha particles (helium nuclei) are emitted from an atom

Question 30

What happens during gamma absorption?

Answer 30

During gamma absorption, the absorption of gamma rays consists of the process in which high energy photons are absorbed by target atoms

Question 31

The speed of transverse waves is directly proportional to?

Answer 31

The propogation speed of transverse waves is directly proportional to the tension applied along the cord

Question 32

What is the formula for the fundamental frequency of a vibrating string?

Answer 32

f = v / 2L Frequency = velocity / 2x length

Question 33

What is the idea of saturation kinetics?

Answer 33

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.

Question 34

Does the dissociation of the myosin head from the actin filament require ATP?

Answer 34

Yes: Dissociation of the myosin head from the actin filament requires the binding of ATP

Question 35

Does the attachment of the myosin head to the actin filament require ATP?

Answer 35

NO: The attachment of the myosin head to the actin filament requires calcium and a triponin/tropomyosin shift

Question 36

Does the conformational change that moves actin and myosin filaments relative to one another require ATP?

Answer 36

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