Menstruation begins in response to
a. rising levels of FSH and LH.
b. falling levels of estrogen.
c. falling levels of progesterone.
d. falling levels of estrogen and progesterone.
e. GnRH secretion.
Answer: d
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Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You repeat
Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?
a. The sun of this new planet emits different wavelengths of light than our own. b. This new organism is using yellow and green light to drive photosynthesis. c. This organism appears green, just like plants on Earth. d. This organism utilizes the most energy-rich photons of the spectrum. e. This new organism is using blue and red light to drive photosynthesis.
Which of the following is a salt?
A. NaOH B. HOH C. H2SO4 D. MgCl2
You are a scientist studying the highly specific interactions of bacteriophages with their host cells when they first encounter the cell. Discuss what microscope(s) and preparation procedures you might use for this study
What will be an ideal response?
What sample statistic is not likely to be used to construct a confidence interval of a population mean?
A. Sample mean B. Sample standard deviation C. Sample range D. Number of observations