Cells naturally, without using energy, respond to changes in water concentration through the process of

a. facilitated diffusion.
b. osmosis.
c. phagocytosis.
d. active transport.


Ans: b. osmosis.

Biology & Microbiology

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All of the following participate in apoptosis except

A) caspases. B) death-promoting proteins. C) mitochondria. D) Bcl-2. E) calcium ions

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Lymphocytic choriomeningitis (LCM) and Lassa fever are considered which type of virus?

a. Adenovirus b. Papillomavirus c. Picornavirus d. Arenavirus

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The perforin-granzyme pathway involves

A) the production of fever, which kills the pathogen. B) the production of antibodies toward the invading pathogen. C) the production of special cell-killing proteins that act on infected or abnormal cells. D) presenting the foreign antigen to B cells. E) binding CD95L to infected cells, which eventually leads to cell apoptosis.

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Enzymes that are only produced when substrate is present are termed

A. constitutive enzymes. B. induced enzymes. C. conjugated enzymes. D. exoenzymes. E. endoenzymes.

Biology & Microbiology