What carries the signal between a neuron sending a message and the neuron receiving it?
a. threshold value
b. action potential
c. neurotransmitter
d. neurohormone
e. resting potential
c
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Which of the following is the most precise description of the role of enzymes in catalyzing biochemical reactions?
A. Enzymes provide the necessary activation energy to overcome the transition state. B. Enzymes stabilize the transition state and decrease its free energy. C. Enzymes cut hard to break bonds allowing the reaction to proceed. D. Enzymes increase the G of the reactions making them proceed rapidly. E. Enzymes decrease the G of the reactions making them proceed rapidly.
A 36-year-old man enters the emergency department with lesions that are painful, red, swollen, and indurated. He is febrile and exhibiting regional lymphadenopathy (swollen glands). The le-sions are marked and well demarcated with a raised border. Which organism is most likely re-sponsible for causing this infection?
a. Streptococcus pyogenes b. P. aeruginosa c. Microsporum spp. d. Bacteroides fragilis group
Which of the following is not true of an organism's genotype?
A. It contains structural genes that code for proteins. B. It has expressed traits governed by the genes. C. It contains genes that code for RNA. D. It has regulatory genes that control gene expression. E. It is inherited.
The reduviid bug carries Trypanosoma cruzi,which is the cause of
a) Chagas disease. b) bubonic plague. c) Rocky Mountain spotted fever. d) babesiosis.