Which of the following terms refers to a bacterium moving towards a light source?
a. Negative phototaxis
b. Negative chemotaxis
c. Positive chemotaxis
d. Positive phototaxis
Answer: d. Positive phototaxis
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A newly developed drug works by blocking thyroid hormone receptors throughout the body. Which of the following would be expected to occur in a patient taking this drug?
A. changes in metabolism B. decreased resorption of bone C. increased uptake of glucose by body cells D. inability to release cortisol E. production of more dilute urine
Character displacement makes competing species less similar, which facilitates __________. Fill in the blank(s) with the appropriate word(s)
You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes
One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent _____. A) leading strands and Okazaki fragments B) lagging strands and Okazaki fragments C) Okazaki fragments and RNA primers D) leading strands and RNA primers
A highly resistant bacterial structure having a low metabolic rate is a(n)
A. pathogen. B. mutation. C. endospore. D. toxin.