An example of an ectothermic organism that has few or no behavioral options when it comes to its ability to adjust its body temperature is a _____
A) sea star living deep in the ocean
B) bass living in a farm pond
C) hummingbird flying through a prairie
D) honeybee in a hive on a rural farm
A
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Colchicine, a chemical extracted from the autumn crocus (Colchicum autumnale), inhibits the formation of
microtubules. Mitotic cells exposed to colchicine will therefore be arrested at ____.
a. anaphase b. interphase c. prophase d. telophase e. metaphase
An exposure to __________ protects against infection with smallpox.
a. cowpox b. penicillin c. chemotherapy d. bacteria e. normal microbiota
The nitrogenous base that is only found in DNA is and not in RNA is
A. uracil. B. cytosine. C. guanine. D. thymine. E. adenine.
In what ways do viruses differ from other pathogens?
A) Viruses lack genetic material. B) Viruses lack cytoplasm and organelles. C) Viruses have no protein structure. D) Viruses are composed of protein only. E) Viruses are composed of both protein and lipid.