A scientific theory has which of the following properties?
A) It agrees with available evidence and all alternative hypotheses have been ruled out.
B) It cannot be rejected.
C) It has been absolutely proven.
D) It does not need to be altered in the light of new evidence.
A) It agrees with available evidence and all alternative hypotheses have been ruled out.
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Mammals that have and care for only a few offspring are likely to exhibit a:
a. type I survivorship curve. b. type II survivorship curve. c. type III survivorship curve. d. type IV survivorship curve.
Select the response that describes a broad-spectrum drug.
A. A drug that is effective against E. coli (Gram-negative) and Staphylococcus aureus (Gram-positive) B. A drug that is effective against Staphylococcus and Streptococcus (Gram-positive) but not Klebsiella (Gram-negative) C. A drug that is effective against Gram-negative organisms D. A drug that is effective against Gram-positive organisms
In 2011, more than 85% of the ________ grown in the United States was transgenic
A) cotton (only) B) corn (only) C) soybeans (only) D) corn, cotton, and soybeans E) corn and soybeans (only)
Sometimes, the most practical way to do an experiment is not to perform it in an animal, but to look at cell responses in culture. Cells from mice, humans, and other mammals have been used to establish cell culture lines that have been very important for research. You are studying a novel water-soluble mouse hormone. You know cell culture can be a practical model to reveal protein function, so you apply the hormone to yeast cells, but nothing happens. What is a likely explanation for why nothing happened in your experiment?
A. Yeast may lack the receptor required for the hormone to act. B. Water-soluble hormones are lipids, not proteins. C. Yeast have a cell wall, so the molecule cannot pass through the cell membrane as it would in mice. D. You need to apply the hormone in large amounts to see an effect.