In science, a theory is:
A) a concept that you try to prove experimentally.
B) a general set of principles supported by evidence.
C) a guess based on previous observations.
D) something that is always true.
Answer: B
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Over-the-counter medications for acid reflux or heartburn block the production of stomach acid. Which of the following cells are directly affected by this medication?
A) goblet cells B) chief cells C) parietal cells D) smooth muscle cells
An experimenter has altered the end of the tRNA corresponding to the amino acid methionine in such a way as to remove the bases AC. Which of the following hypotheses describes the most likely result?
A) tRNA will not form a cloverleaf. B) The amino acid methionine will not become covalently bound. C) The anticodon will not bind with the mRNA codon. D) The aminoacyl-tRNA synthetase will not be formed.
Addition of mitosis-promoting factor (MPF) to germinal cells in the skin arrested in G2 would lead to
____.
a. cessation of cell division b. the cells entering prophase c. the cells undergoing cytokinesis d. cell death e. nothing happening
A primary purpose for the use of stains in microscopy is to increase the (magnification/brightness/contrast) of a specimen.
Fill in the blank(s) with the appropriate word(s).