Which of the following statements is true of viruses?

a. They are a type of bacteria that is able to
live longer.
b. They are the largest of all infective
organisms.
c. They cannot live outside of a cell; they must
enter a living cell to survive.
d. They are easily killed or controlled with
antibiotics.


c. They cannot live outside of a cell; they must
enter a living cell to survive.

Biology & Microbiology

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TNF is ____ for neutrophils

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The greatest incidence of skin cancer (melanoma) would be expected to occur in

A) people who are deficient in vitamin D and live near the poles. B) people who are deficient in folate and live near the poles. C) people who are deficient in vitamin D and live near the equator. D) people who are deficient in folate and live near the equator.

Biology & Microbiology

One day after a biology class four of your friends argue about the difference between phylogeny and systematics. Which friend is right?

A. Friend A states that systematics and phylogenies are really the same, one is more recent than the other, but basically they are the same. B. Friend B says that systematics is the same as cladistics and cladistics is reconstructing clades, which ultimately lead to the development of phylogenies. C. Friend C argues that systematics is the actual collecting and cataloguing of specimens into museums that can be used later by scientists to construct clades and phylogenies. D. Friend D says that the way she remembers is that systematics is the reconstruction and study of phylogenies.

Biology & Microbiology

The ____ is/are responsible for closing off the airway during swallowing

a. larynx b. epiglottis c. pharynx d. intercostal muscles e. pleura

Biology & Microbiology