Biology
General Chemistry
Organic Chemistry
Quantitative Reasoning
Physics
200
A segment of DNA contains the following code: ATGCAT. What would the sequence of its transcribed mRNA be?
UACGUA
RNA contains the base uracil (U) rather than thymine (T) as in DNA.200
The coexistence of solid, liquid and gas in thermodynamic equilibrium is called:
A. Melting point
B. Triple point
C. Condensation point
D. Equilibrium point
E. Coexisting point
B. Triple point
200
What is the relationship between the following two molecules:
A. Enantiomers
B. Identical compounds
C. Meso compounds
D. Diastereomers
E. Structural isomers
D. Diastereomers
Due to the molecules not being mirror images of each other and non-superimposable, they are indeed diastereomers.
200
w=?
A. 5/24
B. 15/24
C. 1 7/8
D. 1 15/8
E. 8
C. 1 7/8
200
If Kevin weighs 80N on planet Earth, what will his weight be on the moon?
A. The same
B. He will weigh more on the moon
C. He will weigh less on the moon
D. Cannot be determined
C. He will weigh less on the moon
Weight = mass x gravity
Kevin will have the same mass on Earth and the moon, but gravity on the moon is lower than the gravity on the Earth. Due to the correlation between Weight and gravity, a lower gravity means a lower weight.
400
A double-stranded DNA molecule consists of 20% Guanine. What percentage does Thymine represent in this stand?
A. 40%
B. 25%
C. 30%
D. 60%
E. 75%
C. 30%
Guanine pairs up with Cytosine. So if 20% of the DNA stand is Guanine, it means 20% of it is Cytosine. Thus, the 60% left is made up of Adenine and Thymine. Since Adenine pairs up with Thymine, it must be evenly split into 30:30. Thus, 30% is composed of Thymine.
400
If 500mL of 0.5M HBr is diluted to 0.4M HBr, What is the final volume?
A. (500)(0.4/0.5)
B. (500)(0.5/0.4)
C. (0.5/500)(0.4)
D. (500)(0.20)
E. (500-0.4)(0.5)
B. (500)(0.5/0.4)
(initial molarity)(initial volume)=(final molarity)(final volume)
400
Which of the following is an example of keto-enol tautomerism?
A. 
B. 
C. 
D. 
E. B & C
E. B & C
Keto-enol tautomerism is the equilibrium between a keto form and an enol form (alcohol) of a chemical. In this scenario, both answer choices B and C are applicable keto-enol tautomers, although the frequency of one form compared to another may be shifted.
400
In a classroom of 189 students, the ratio of boys to girls is 5:4. How many boys are there in the classroom?
A. 38
B. 84
C. 105
D. 120
E. 155
C. 105
Divide the total number of students (189) by the combined ‘parts’ (5+4=9). Thus 189/9 = 21.
Multiply 21 by the gender of interest ratio (5): 21(5)= 105 male students
400
Rank the following in the correct order of increasing wavelength:
A. Gamma rays, X-rays, UV, Infrared, Radio waves
B. X-rays, Gamma rays, UV, Infrared, Radio waves
C. Radio waves, Infrared, UV, X-rays, Gamma rays
D. Gamma rays, X-rays, Infrared, UV, Radio waves
E. X-rays, Gamma rays, Visible light, Radio waves, UV
A. Gamma rays, X-rays, UV, Infrared, Radio waves
600
Which of the following represents the most accurate passageway for air in humans?
A. Mouth --> Pharynx --> Trachea --> Bronchi --> Bronchioles --> Alveoli
B. Mouth --> Pharynx --> Alveoli --> Bronchi --> Bronchioles
C. Mouth --> Esophagus --> Bronchi --> Bronchioles --> Alveoli
D. Mouth --> Pharynx --> Larynx --> Esophagus --> Alveoli --> Bronchi
E. Mouth --> Alveoli --> Bronchi --> Trachea
A. Mouth --> Pharynx --> Trachea --> Bronchi --> Bronchioles --> Alveoli
600
Which of the following molecules is incorrectly matched to its molecular geometry?
A. BeCl2 - Linear
B. BF3 - Trigonal planar
C. SO2 - Bent
D. SF6 - Square pyramidal
E. NH3 - Trigonal pyramidal
D. SF6 - Square pyramidal
SF6 is octahedral. It is vital to know the basic VSEPR system, ranging from bond angles to molecular geometry.
600
In IUPAC nomenclature, which of the following functional groups has the highest priority in numbering a parent chain?
A. Alkanes
B. Alkenes
C. Alkynes
D. Amines
E. Esters
E. Esters
600
What is the sum of the interior angles of a regular nonagon?
A. 900°
B. 1080°
C. 540°
D. 1260°
E. 1440
D. 1260°
The sum of interior angles for any regular shaped polygon can be determined with the following equation:
(n-2) x 180°
Where n is # of sides.
600
A spring is sitting in an equilibrium position. What would happen to the force of the spring if you pulled the spring to a length double of that of its equilibrium?
A. Force would half
B. Force would stay the same
C. Force would double
D. Force would quadruple
E. Not enough information is provided
C. Force would double
This is a conceptual problem testing your understanding of Hooke’s Law:
F = -kx ; where x=displacement from the equilibrium position
Doubling the displacement (x) would double the force (F).
800
During what stage of meiosis does crossing-over most often occur on chromosomes?
A. Prophase I
B. Metaphase II
C. Prophase II
D. Anaphase I
E. Telophase I
A. Prophase I
Homologous chromosome come together to form a tetrad during Prophase I in which the ends of the chromosomes have the opportunity to cross-over and create more genetic diversity.
800
What is the total number of atoms contained in 2 moles of sulfur? (Molecular Weight of sulfur = 32.06 g)
A. 6.02 x 1023
B. 32
C. 64
D. 1.2 x 1024
E. 6.02 x 1024
D. 1.2 x 1024
One mole of anything is 6.02 x 1023 atoms. So two moles is simply twice that. (12.04 x 1023 = 1.2 x 1024)
In this question, the MW is not needed to solve the problem.
800
Which of the following are NOT part of Huckel's criteria for aromaticity?
A. Be cyclic
B. Have one 2p orbital on each atom of the ring
C. Be planar
D. (4n+2)π electrons
E. All of the above
E. All of the above
800
Kevin throws 3 dice. Each die is six-sided and is numbered 1-6. All sides are equally likely to be rolled. What is his probability of rolling 3 fours?
A. 1/6
B. 1/36
C. 1/216
D. 1/12
E. 1/3
C. 1/216
Rolling 3 fours is an independent event. Chance of rolling 1 four is 1/6. So chance of rolling 3 fours is: (1/6)(1/6)(1/6) = 1/216
800
A bat uses echolocation to identify objects. A bat is traveling to west emits a sound (also heading towards the west) to a stationary object. Which of the following is most accurate in regards to the frequency perceived by the object?
A. Frequency will be the same
B. Frequency will be higher than the originally emitted one
C. Frequency will be lower than the originally emitted one
D. Frequency will not return
E. Cannot determine
B. Frequency will be higher than the originally emitted one
This is characteristic of the Doppler Effect. If 2 objects are approaching another, or if one is stationary and the other is approaching the object, then the received frequency will be higher than the emitted frequency.
1000
Organisms that utilize solar energy to exist are called:
A. Apotrophic
B. Autotrophic
C. Heterotrophic
D. Chemotrophic
E. Mixotrophic
B. Autotrophic
Autotrophic organisms use sunlight as a source of energy (e.x. plants).
1000
In the following equilibrium, which of the following actions will shift the equilibrium to the right?
3H2(g) + N2(g) <---> 2NH3(g)
A. Adding extra NH3(g)
B. Removing N2(g)
C. Removing H2(g)
D. Increasing the pressure
E. None of the above
D. Increasing the pressure
Le Chatelier’s principle
Answer choices A-C all cause the reaction to shift to the left (towards the reactants). Increasing the pressure shifts the reaction towards the side with the fewer molecules (in this case, the product side). Thus, increasing the pressure shifts the reaction to the right to restore equilibrium.
1000
Which of the following is FALSE regarding SN2 reactions?
A. SN2 occurs in one step
B. Common solvents include DMSO and acetone
C. Steric hindrance increases from primary to secondary to tertiary
D. SN2 prefers to proceed with strong nucleophiles
E. None of the above
E. None of the above
All of the answer choices accurately represent SN2 reactions. It is VITAL to know what SN1, SN2, E1 and E2 reactions are and their differences.
1000
A wall that is 9ft x 10ft costs $88 to paint. How much would it cost to paint a wall that is 21ft x 30ft?
A. $264
B. $350
C. $593
D. $616
E. $682
D. $616
It will cost $88 to paint an area of 90 square feet (9ft x 10ft). The new wall has 630 square feet (21ft x 30ft). Thus, the new area is 7x bigger (630 square feet / 90 square feet = 7), and thus, 7x more expensive.
7 x $88 = $616
1000
Diverging lenses always produce what type of image?
A. Virtual
B. Upright
C. Smaller than the object
D. All of the above
E. None of the above
D. All of the above
All of these characteristics are indeed relevant to diverging lenses as the location of the object is irrelevant compared to converging lenses.
It is important to understand the basic concepts of mirrors and lenses as they are a decent chunk of the physics on the OAT.