How can a hormone that is present in very small quantities within the bloodstream elicit such a large response within a cell?
-Cells degrade the hormone into many tiny molecules, and then each piece creates a response within the cell.
-The hormone is only taken up by the largest cells in the body, and thus it can elicit a large response.
-The hormone is always an extra large macromolecule even though it is present in minute quantities.
-The message from the hormone is amplified many times within the cell.
The message from the hormone is amplified many times within the cell.
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A. amoebiasis. B. cryptosporidiosis. C. balantidiasis. D. giardiasis.
How are nonnative species frequently transported?
a. Acquired for home aquariums b. Cargo containers c. Aquaculture d. Ships' ballast
The organism that causes the sexually transmitted disease trichomoniasis is a _____
a. flagellated protozoan c. ciliate b. radiolarian d. apicomplexan
Which term is used to describe an animal's ability to survive if the cells are exposed to a hypotonic or hypertonic environment?
A. feedback regulation B. facilitated diffusion C. osmosis D. osmoregulation