Which pigment(s) do red algae contain?
a. chlorophyll a
b. chlorophyll a and chlorophyll b
c. chlorophyll a, chlorophyll b, and phycoerythrin
d. chlorophyll a, phycocyanin, and phycoerythrin
Answer: D
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Plants that are dioecious are best described as having:
A. staminate and carpellate flowers on separate plants B. all flower parts in pairs C. flower parts that may be absent at certain seasons D. flower arrangements unique to eudicots E. flower arrangements unique to monocots
If you applied a toxin that blocked non-voltage-gated potassium channels (i.e., the potassium "leak channels") in a resting neuron, it would cause the membrane potential to be
A. less negative. B. more negative. C. No change would be observed.
Earthworms show all of the following features except
A. containing segments with a mouth on the first and the anus on the last. B. containing touch-sensitive and light-sensitive organs in the segments. C. containing fewer setae than in polychaetes. D. containing distinct head regions and parapodia. E. being hermaphroditic.
Studies show that the worldwide age for onset of puberty, particularly early breast development, has begun earlier each decade. In fact, between 1991 and 2006, the age for onset of breast development in girls adjusted by a full year (from a mean age of 10.9 to 9.9). While several theories have emerged about what is causing the earlier presence of female sex characteristics, one prominent theory is that it is due to ubiquitous early exposure to hormones in food products from the agricultural industry. If you were a researcher in this field, which of the following hormones would you look for in food?
a. testosterone b. LH c. estrogen d. FSH