In order for a cell to respond to the signaling molecule epinephrine, it must have ____
a. ion channels
b. a lipid bilayer through which epinephrine can pass
c. receptors with an epinephrine binding site on the cytoplasmic side of the plasma membrane
d. receptors with an epinephrine binding site on the plasma membrane surface
e. nuclear membrane receptors
ANSWER: d
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Which part of the sperm contains the chromosomes?
A. flagella B. tail C. middle piece D. cell membrane E. head
How do the numbers of chromosomes differ for organisms?
A) Among all known living creatures, humans have the most chromosomes. B) Animals have more chromosomes than plants. C) Eukaryotes have more chromosomes than prokaryotes. D) Prokaryotes have more chromosomes than fungi.
An elderly woman is experiencing fever, chest pain, difficulty breathing, and a cough that occasionally brings up mucus containing blood. She reports having visited family in rural New Mexico over the Labor Day weekend. A GMS-stained sample from her lungs shows the presence of large spherules. Which of the following is the most likely infecting agent?
A) Coccidioides immitis B) Blastomyces dermatitidis C) Histoplasma capsulatum D) Paracoccidioides brasiliensis E) Trichophyton rubrum
Antitoxins
A. include capsule material against the pneumococcus and meningococcus. B. contain purified, chemically denatured bacterial exotoxin. C. contain antibodies to neutralize specific toxin. D. use vaccinia virus with genetic material of bacterial toxins. E. contain attenuated organisms.