MCAT Style Quiz!

A musician plays the trumpet in a marching band. The musician tunes the trumpet inside a room and then goes outside to play. When outside, the trumpet sounds flat (plays a lower frequency). Which of the following has occurred to account for the decrease in the frequency?

• The air outside is warmer than inside, which increased the speed of the sound waves.

• More energy is dissipated outside, which caused the sound waves to lose energy.

• The musician shortened the length of the trumpet, which decreased the wavelength of the sound waves.

• The air outside is cooler than inside, which decreased the speed of the sound waves.

Tags

NGSS.HS-PS4-1

Which statement most accurately describes the reaction sequence shown?

• Strecker synthesis of D,L-leucine

• Gabriel synthesis of L-valine

• Strecker synthesis of L-valine

• Strecker synthesis of D,L-valine

Tags

NGSS.HS-LS1-6

Thermophiles are microorganisms that thrive at temperatures above 40 degrees Celsius. Which of the following characteristics LEAST accurately describes an enzyme isolated from a thermophile?

• Its optimal catalytic activity occurs above 40 C

• It is resistant to thermal denaturation

• It has a relatively low catalytic rate at room temperature

• It loses tertiary structure at temperatures below 37 C

One function of the lymphatic system is to:

• redistribute fluid in the body

• facilitate the exchange of respiratory gases in the lungs

• collect filtrate from the blood for excretion

• produce plasma proteins

L-ascorbic acid exists in equilibrium between compounds 1 and 2 in acidic solution. What type of function group is formed when compound 1 cyclizes?

• lactam group

• amide group

• lactone group

• anhydride group

In the circuit shown, the currents through resistors R2 and R3 are 4 A and 2 A respectively. Resistor R1 has a resistance of 1.33 ohms. What is the voltage drop across resistor R3?

• 24 V

• 20 V

• 18 V

• 16 V

What is the IUPAC name of the compound shown?

• 2-cyclopropyl-6,6-diethyl-2-methylnonane

• 2-cyclopropyl-2-methyl-6-ethylnonane

• 2-cyclopropyl-6-ethyl-2-methyl-6-propyloctane

• 8-cyclopropyl-4,4-diethyl-8-methylnonane

Researchers studying the antiviral chemical ribavirin in cells infected with a certain virus hypothesize that ribavirin acts as a mutagen. Which of the following observations support this hypothesis?

• Disruption of viral metabolic processes in host cells treated with ribavirin

• Disruption of viral entry into the cytoplasm of host cells treated with ribavirin

• increased cell cycle progression in host cells treated with ribavirin

• decreased production of viral molecules required for viral replication in host cells treated with ribavirin

Tags

NGSS.HS-LS3-2

During the synthesis of a tosylate, which of the following pairs of atoms form a covalent bond?

• C and Cl

• S and O

• S and Cl

• C and O

The sequence pictured represents a mature mRNA molecule in a eukaryotic cell.

If translation of this mRNA molecule were to occur, which of the following most likely corresponds to the anti codons of the first and last tRNAs that would be brought into the ribosome, respectively?

• 3'-TAC-5' and 3'-GCT-5'

• 3'-UAC-5' and 3'-UUU-5'

• 3'-CGC-5' and 3'-TTT-5'

• 3'-UAC-5' and 3'-GCU-5'