Physics
A jet is flying parallel to a receiver both at a constant speed. If the jet is traveling at a speed of 300 m/s then what is the change in the frequency of the sound according to the doppler effect?
0 hz
If Sara can read 15 pages in 10 minutes, how long will it take her to read 45 pages?
30 minutes
A cytoplasmic kinase acts on the 231st residue of HIV protease. What is most likely the identity of the 231st residue of HIV protease?
A) W
B) Y
C) L
D) D
B) Y
What phase of the cell cycle does crossing over occur?
Prophase
This type of bond forms when electrons are shared between two atoms, as seen in molecules like water and carbon dioxide.
What is a covalent bond?
A system of pipes in a sewage treatment system leads to an anaerobic sludge digester. The main pipe has a circular frame with a radius of 2 cm at its start, but expands to 8 cm as it approaches the sludge digester. If the speed of the fluid on the walls of the beginning of the pipe is 4 m/s, then what is the force of the fluid on the wall of the pipe when it expands?
2.5 m/s
Restaurant customers tip their server only 8 percent for poor service. If their tip was $3.70, how much was their bill?
$46.25
The enzyme trypsin, which catalyzes the hydrolysis of proteins within the lumen of the small intestines, functions less optimally at pH values below B. The most likely reason for this is that:
A) the activity of trypsin is feedback-inhibited
B) trypsin expression is increased at elevated pH
C) peptides denature only under acidic conditions
D) the tertiary structure of trypsin is changed
D) the tertiary structure of trypsin is changed
Fragile x syndrome is a recessively inherited disorder. If a mother is a carrier for fragile x syndrome, then what is the likelihood that her sons will express the disorder?
50%
The equation F=qE describes the force experienced by a charged particle in this type of field.
What is an electric field?
An object is viewed through a convex lens with a focal length of 3 cm. If the object is placed 12 cm from the lens, what is the magnification of the object?
1/3
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Which enzyme catalyzes the removal of the phosphoryl group attached to an R group of amino acids?
A) protein kinase
B) hexokinase
C) protein phosphatase
D) glucose-6-phosphatase
C) protein phosphatase
MicroRNAs are small noncoding RNA molecules that bind to mRNA sequences and cause their degradation. Which disorder could not be treated with microRNA therapy?
A) Phenylketonuria - A disorder where the gene for an enzyme necessary in the production of phenylalanine is mutated
B) Lesch-Nyhan syndrome - A disorder caused by overproduction of gene products that produce uric acid
C) A cancer caused by an overproduction of oncogenes
D) All of the above can be treated with microRNAs
a. Phenylketonuria - A disorder where the gene for an enzyme necessary in the production of phenylalanine is mutated
This type of reinforcement schedule provides a reward after an unpredictable number of responses and is associated with high rates of response, such as gambling.
What is a variable-ratio schedule?
If a ball is thrown at a speed of 25 m/s at a height of 1 m an angle of 37º above the horizontal, then what is its final velocity in the y direction when it hits the ground?
Approximately 15 m/s downward
Choose the algebraic expression that best represents the following situation: Jeral’s test score (J) was 5 points higher than half of Kara’s test score (K).
A) J = 1/2K + 5
B) J = 2K -5
C) K = (J - 1/2) - 5
D) K = 1/2J - 5
A) J = 1/2K + 5
Starting from the synthesis, which of the following correctly depicts the pathway followed by a membrane glycoprotein in a eukaryotic cell?
A) Smooth ER --> transport vesicle --> cis-golgi --> trans-golgi --> plasma membrane
B) Rough ER --> transport vesicle --> cis-Golgi --> trans-Golgi --> plasma membrane
C) Smooth ER --> transport vesicle --> trans-Golgi --> cis-Golgi --> plasma membrane
D) Rough ER --> transport vesicle --> trans-Golgi --> cis-Golgi --> plasma membrane
B) Rough ER --> transport vesicle --> cis-Golgi --> trans-Golgi --> plasma membrane
What protein is responsible for unwinding the DNA in the process of DNA replication?
DNA helicase (or topoisomerase)
In cellular respiration, this enzyme is responsible for the final step of oxidative phosphorylation, transferring electrons to oxygen to form water.
What is cytochrome c oxidase?
If a photon has a wavelength of 2.5 x 10^18 m, then what is the energy of the photon?
7.95 x 10^-44 J
Bob decides to go into business selling lemonade, even though he does not like lemonade. He just wants to make some money. He buys a wooden stand for $45 and sets it up outside of his house. He figures that the cost of lemons, sugar, and paper cups for each glass of lemonade sold will be $0.10. Create an algebraic expression that describes his cost for making “g” glasses of lemonade.
$45 + ($0.10 x g)
In a polypeptide chain, which of the following amino acids, when consecutively present in large numbers, can NOT form an alpha-helix structure at pH 7.0?
A) His
B) Ile
C) Lys
D) Ala
C) Lys
Which technique would you utilize to quantify the amount of protein that you have in a sample based solely on its size?
A) Native gel electrophoresis then western blotting
B) Native gel electrophoresis then northern blotting
C) Sodium dodecyl sulfate gel electrophoresis then western blotting
D) Sodium dodecyl sulfate gel electrophoresis then western blotting
C) Sodium dodecyl sulfate gel electrophoresis then western blotting
This type of reaction involves a nucleophile attacking an electrophile, leading to the replacement of a leaving group, and comes in two main mechanisms: SN1 and SN2.
What is a nucleophilic substitution reaction?