Antihistamines are used to treat some allergic symptoms because they neutralize the histamine mediators that cause rapid dilation of blood vessels and contraction of smooth muscles that initiate the symptoms of systemic anaphylaxis
Indicate whether the statement is true or false.
Answer: TRUE
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Which of the following is a property of all living organisms?
a. Reproduce using RNA. b. Use the sun to fuel metabolic processes. c. Grow and develop based on inherited RNA. d. Respond to stimuli in the external environment.
The graph above shows the temperature profile for T. aquaticus polymerase, an enzyme used by a species of bacteria that
lives in hot springs. What does the boxed region indicate?
a. The enzyme activity increases as substrates increase their kinetic energy. b. The enzyme activity decreases as substrates increase their kinetic energy.
c. The enzyme activity increases as the enzyme denatures. d. The enzyme activity decreases as the enzyme denatures. e. The enzyme activity decreases as the enzyme refolds.
Normal biota generally exist in either a _______ or _________ association with their hosts
Fill in the blank(s) with the appropriate word(s).
What role do NADH and FADH2 serve in catabolism?
A. NADH and FADH2 donate electrons to oxygen. B. NADH and FADH2 are electron carriers. C. NADH and FADH2 donate electrons to ATPase (ATP synthase). D. NADH and FADH2 pump protons across a membrane.