Which cells can act as antigen-presenting cells?

A. helper T cells and cytotoxic T cells
B. macrophages and helper T cells
C. macrophages and B cells
D. cytotoxic T cells and B cells


Answer: C. macrophages and B cells

Biology & Microbiology

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If you touch a hot pan while cooking, this is detected by __________, and the smell of the

cooking food is detected by __________.

a. thermoreceptors; chemoreceptors b. pain receptors; mechanoreceptors c. mechanoreceptors; chemoreceptors d. chemoreceptors; photoreceptors

Biology & Microbiology

The species types that have the highest percentage found to be threatened compared to those evaluated is ________

a. green algae b. lichens and mushrooms c. crustaceans d. angiosperms

Biology & Microbiology

Which of the following statements concerning Rocky Mountain spotted fever is correct?

A. The causative bacterium is transmitted by Ixodes ticks. B. Infections are seen in highest numbers in the Rocky Mountains. C. An infection rarely has complications beyond mild discomfort. D. Disease symptoms include fever, headache, and rash.

Biology & Microbiology

Female blue-footed boobies of the Galápagos Islands will mate only after a specific courtship display on the part of the male. The male high-steps to advertise his bright blue feet

What mechanism describes why the females do not mate with other species of boobies? A) Temporal isolation B) Ecological isolation C) Geographic isolation D) Mechanical incompatibility E) Behavioral isolation

Biology & Microbiology