The cause of stomach ulcers appears to be
A. excess stomach acid.
B. diets rich in meat products.
C. drinking too much coffee.
D. extreme stress.
E. the bacterium Helicobacter pylori.
Answer: E
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After an active cytotoxic T cell binds to an ailing cell, it releases toxins that ____
a. poke holes in the cell and cause it to die b. bind to the cell and prevent it from harming other "self" cells c. attract macrophages to the cell d. attract antibodies directed at "self" cells e. stimulate inflammation
If the bacteriophage lambda enters into a host cell and integrates its genome into the host cell, the phage has entered the ________ cycle.
Fill in the blank(s) with the appropriate word(s).
The energy source of photosynthesis is
A. oxygen. B. sunlight. C. carbon dioxide D. chlorophyll. E. glucose
Which level of biological organization is composed of tissues?
(a). organism (b). organ system (c). organ (d). cell (e). molecules