Physics and Math
How would the number 17,060 be written in scientific notation?
a. 1706 x 10^1
b. 1.706 x 10^4
c. 1.7060 x 10^4
d. 0.17060 x 10^5
B. 1.706 x 10^4
Scientific notation AND sig figs (everyone's favorite)
Mitochondrial DNA is:
I. circular
II. self-replicating
III. single-stranded
a. I only
b. II only
c. I and II only
d. I, II, and III
C - circular and self-replicating
Mitochondrial DNA (mDNA) is similar to bacterial DNA and are organized into a single circular chromosome of double-stranded DNA (III is incorrect).
What is the character of the bond in carbon monoxide?
a. ionic
b. polar covalent
c. nonpolar covalent
d. coordinate covalent
B - polar covalent
Carbon monoxide, CO, has a triple bond between carbon and oxygen each retaining one lone pair. Oxygen is significantly more electronegative than carbon.
Which of the following fine motor tasks would one expect to see first in an infant?
a. grasping for objects with two fingers
b. following objects with the eyes
c. scribbling with a crayon
d. moving a toy from one hand to the other
B - following objects with eyes
Motor skills develop from the core toward the periphery.
What word describes a student who is interested in medicine?
a. amazing
b. extraordinary
c. crazy
d. inspiring
e. all of the above
E - all of the above
YOU ARE ALL AMAZING, EXTRAORDINARY, A LITTLE BIT CRAZY, BUT MOST OF ALL INSPIRING. The medical field is difficult to work through but you all can DO IT! Never give up and always believe in yourself!!
The value of 200^0.25 is closest to:
a. 4
b. 14
c. 50
d. 800
A - 4
0.25 is the fourth root of 200, so square root 200, then square root again!
Lymphoma is cancer of the cells of lymphoid lineage. These cells often reside within lymph nodes. What type of cell is NOT likely to cause a lymphoma?
a. CD8+ T-cells
b. B-cells
c. Macrophages
d. Th1 cells
C - macrophages
B cells and T cells are lymphocytes. Macrophages are not lymphocytes.
How much time is allotted for this section?
a. 93
b. 94
c. 95
d. 96
C - 95 minutes! That's a long time!
Which of the following is not a taste modality?
a. sweet
b. floral
c. savory
d. bitter
B - floral
The five tastes are sweet, sour, salty, bitter, and umami!
a. 8
b. 5
c. 7
d. 6
C - 7
Good job! Asia, N. America, S. America, Europe, Africa, Australia, Antarctica
An object is placed at the center of curvature of a concave mirror. Which of the following is true about the image?
a. real and inverted
b. virtual and inverted
c. real and upright
d. virtual and upright
A - real and inverted
Because d (or i) is positive, the image is real, and all real images are inverted
How many quesitons for this section would you see on the MCAT?
a. 53
b. 59
c. 57
d. 60
B - this is the correct number! Good job!
Which of the following is not a Bronsted-Lowry base?
a. NH3
b. F-
c. H2O
d. NO2H
D - NO2H
Bronsted-Lowry base is a proton-acceptor (A, B, and C), while a Bronsted-Lowry acid is a proton donator, NO2H.
Which part of the eye is responsible for gathering and focusing light?
a. cornea
b. pupil
c. iris
d. retina
A - cornea
The cornea gathers and focuses light.
The pupil and iris both regulate the amount of light coming into the eye but not in focusing it.
The retina transduces the light into electrical signals that are sent to the brain.
How many bones in the body?
a. 203
b. 284
c. 246
d. 206
D - 206
Woah! That's a lot! but not as much at 284... just sayin
In which of the following media does sound travel the fastest?
a. vacuum
b. air
c. water
d. glass
D - glass
Sound needs matter to travel through (eliminating A) and speed of sound is fastest in solid materials, then liquids, then gases.
Which of these amino acids has a chiral carbon in its side chain?
I. Serine
II. Threonine
III. Isoleucine
a. I only
b. II only
c. II and III only
d. I, II, and III
C - Threonine and Isoleucine
Every amino acid except glycine has a chiral alpha carbon, but only two also have a chiral carbon in their side chains.
An electron is known to be in the n=4 shell and the l=2 subshell. How many possible combiinations of quantum numbers could this electron have?
a. 1
b. 2
c. 5
d. 10
D - 10
m sub l can be -2, -1, 0, 1, or 2 and m sub s can be positive or negative. Thus there are 5 x 2 = 10 possible combinations of quantum numbers.
A credit card company begins applying an interest rate to credit card accounts in response to late payments. This is an example of:
a. positive reinforcement because the bank will now make more money
b. negative reinforcement because the bank is adding a fee to motivate the person to pay their bills
c. positive punishment because the bank is adding a fee to reduce the incidence of late payments
d. negative punishment because the bank is decreasing the amount the person has to pay
C - positive punishment because the bank is adding a fee to reduce the incidence of late payments
How many letters in the english alphabet?
a. 24
b. 27
c. 26
d. 21
C - 26
Unless it's 21... and we're missing U R A Q T
In experiment A, a student mixes ink with water and notices that the two liquids mix evenly. In experiment B, the student mixes oil with water; in this case, the liquids separate into two different layers. The entropy change is:
a. positive in experiment A and negative in experiment B
b. positive in experiment A and zero in experiment B
c. negative in experiment A and positive in experiment B
d. zero in experiment A and negative in experiment B
B - positive in A, 0 in B
In A, when the ink intersperses throughout the water, the final state is more disordered than the initial state (entropy is positive)!
In B, The oil separates from the water and the entropy change is zero.
A membrane receptor is most likely to be a(n):
a. embedded protein with catalytic activity
b. transmembrane protein with sequestration activity
c. membrane-associated protein with sequestration activity
d. transmembrane protein with catalytic activity
D - transmembrane protein with catalytic activity
Membrane receptors have both an extracellular and intracellular domain and are considered transmembrane proteins. They display enzymatic activity in order to initiate second messenger cascades.
Carboxylic acids can be reacted in one step to form all of the following compounds EXCEPT:
a. esters
b. amides
c. alkenes
d. alcohols
C - alkenes
To form alkenes, carboxylic acids are reduced to alcohols, which can be transformed into alkenes by elimination.
All of the following brain regions are primarily responsible for the experience of emotions except the:
a. amygdala
b. prefrontal cortex
c. basal ganglia
d. thalamus
C - basal ganglia
The basal ganglia are involved in smooth movement and are not primarily responsible for the experience of emotions.
Consider the age you are now. If you were born 12 years ago, how old would you be today?
Yay! You are totally going to do a great job on the MCAT!!