If a hypothesis stands after years of repeated testing, is consistent with all data gathered, and helps make successful predictions about other phenomena, it is considered to be a ____
a. speculative idea
b. proven theory
c. proven hypothesis
d. law of nature
e. scientific theory
ANSWER: a
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If you or a loved one are confronted with possible cancer diagnosis, you may hear terms such as benign or cancerous in describing abnormal growth or structure of cells. A diagnosis of benign or precancerous polyps describes areas where you have raised clusters of cells lining the walls of your colon. The polyps can continue to grow abnormally, and may pose risk of developing into colorectal cancer. What is the key distinction of the polyps that an oncologist cancer physician would use to determine the point that the polyps are cancerous?
A. when the polyps begin to decrease in size B. when the cells are reproducing at abnormal rates, or in clusters of abnormal traits C. when damage occurs to the polyps, and there is visible bleeding from them when you go to the bathroom D. when the polyps begin interfering with your normal colon functions and cause discomfort E. when the abnormal polyp cells begin invading other tissues of your body
________ is an active form of the protein that stimulates the adrenal gland to release aldosterone
Fill in the blank(s) with correct word
The effects of the activation of protein kinase do not include:a
alteration of membrane permeability. b. activation of adenylyl cyclase. c. activation of gene expression. d. phosphorylation of the target protein. e. alteration of cellular metabolism.
How do all viruses differ from bacteria?
A) Viruses are filterable. B) Viruses are obligate intracellular parasites. C) Viruses do not have any nucleic acid. D) Viruses are not composed of cells. E) Viruses do not reproduce.