A client has a serious case of the flu. A random sample of sputum was taken from the patient coughing up blood. The lab tech said they had isolated a bacterium that did not have any peptidoglycan. You hypothesize that the identity of this microbe could possibly be
A. Mycobacterium tuberculosis.
B. Borrelia burghdorferi.
C. Streptococcus pneumoniae.
D. Mycoplasma pneumoniae.
E. Staphylococcus aureus.
Ans: D. Mycoplasma pneumoniae.
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The initial depolarization associated with the action potential is the consequence of the opening of _________________ at the axon hillock
A. voltage-gated potassium channels B. voltage-gated calcium channels C. voltage-gated sodium channels D. voltage-gated chloride channels
Which immune system cells primarily function as antibody producers and originate from stem cells?
a. B lymphocytes b. T lymphocytes c. Natural killer cells d. Neutrophils
What is the difference between neurotransmitters and neuropeptides?
a. Neuropeptides are generated by neuronal cells but do not transmit signals. b. Neurotransmitters are small hydrophilic molecules and neuropeptides are small proteins. c. Neurotransmitters are small protein molecules and neuropeptides are large ones. d. Some neuropeptides can act on distant cells, whereas neurotransmitters cannot.