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BCH EXAM 2 questions with verified answers updated
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BCH EXAM 2 questions with verified answers updated
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BCH EXAM 2What is the primary storage form of fatty acids? - correct answer ✔✔D) triglycerides
A pore that simultaneously transports two different molecules in the same direction is called a(n) -
correct answer ✔✔B) symporter
Which of the following may undergo transverse diffusion within the lipid bilayer? - correct answer ✔✔A)
membrane lipids
In which type of reversible inhibition does binding substrate facilitate binding of the inhibitor? - correct
answer ✔✔C) uncompetitive
Which of the following is a ligand of the β2-adrenergic receptor? - correct answer ✔✔C) norepinephrine
Which of the following curves shows the appropriate relationship between [S] and time? - correct
answer ✔✔B) (b) Slow negative slope
ADP binds to platelets in order to intiate the activation process. Two binding sites were identified on
platelets, one with a Kd of 350 nM and one with a Kd of 7.9 µM. Which of these is the low-affinity
binding site? - correct answer ✔✔B) The binding site with a Kd of 7.9 µM is the low affinity site
What type of chemical species can participate in catalysis by binding substrates to orient them properly,
by undergoing reversible changes in oxidation state, and by stabilizing negative charges: - correct answer
✔✔A) transition metal cations
G proteins: - correct answer ✔✔A) consist of three subunits, Gα, Gβ, and Gγ.
Which of the following would represent the reaction coordinate for a slow reaction? - correct answer
✔✔B) B Big Hump
, The rate constant associated with the reaction below would be
A + B --> C - correct answer ✔✔C) Second order
Nerve cells contain high levels of _____ which is a derivative of _____. - correct answer ✔✔D)
sphingomyelin; sphingosine
How does the addition of an enzyme to a chemical reaction affect the activation energy of the reaction?
- correct answer ✔✔B) Decreases it
Hydrolysis of ATP by the Na,K-ATPase moves _____ while dephosphorylation moves _____. - correct
answer ✔✔A) 3 Na+; 2 K+
What is the ΔG for transport of glutamate from the outside of the cell, where the concentration of 0.1
mM,
to the inside of the cell, where the concentration is 10 mM? Assume the cell potential is -70 mV and the
temperature is 37oC. - correct answer ✔✔D) +18.6 kJ/mol
Small mammalian hibernators can withstand body temperatures of 0oC to 5oC without injury. However,
the body fats of most mammls have melting temperatures of approximately 25oC. Predict how the
composition of the body fat of hibernators might differ from that of their nonhibernating cousins. -
correct answer ✔✔A) Hibernators will contain a higher percentage of polyunsaturated fatty acids.
Which of the following is NOT a way in which biological catalysts differ from nonbiological catalysts? -
correct answer ✔✔A) Only biological catalysts are not permanently altered or consumed as a result of
the reaction.
Voltage-gated channels are more likely to be composed of - correct answer ✔✔A) transmembrane α
helices.
Kinetic studies are carried out for a Michaelis-Menten enzyme at a specific concentration of enzyme.
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