Chemolithotrophs near hydrothermal vents support a variety of life forms. Why is this analogous to photosynthetic microbes supporting life forms closer to the surface of the planet?
A.
Because all life forms need some energy source, electron source, and carbon source. Chemolithotrophs fix inorganic carbon and, if consumed by other microbes, could serve as sources for all three requirements for life. This is very similar to the role that photosynthetic microbes play in the top levels of the oceans/lakes.
B. Because chemolithotrophs will also utilize energy from sunlight to form their sugars/get their chemical energy...much like photosynthetic microbes.
C. Because chemolithotrophs also pull in carbon dioxide as their carbon source, just like photosynthetic microbes.
D. Because photosynthetic microbes utilize heat energy from the sun as an energy source. Chemolithotrophs utilize heat energy from hydrothermal vents, but it's still heat energy. This makes both microbes similar.
A
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You have a polymer of DNA with 10 adenine bases followed by 10 cytosine bases. If that strand bonded to a strand of 20 thymine bases, how would the double helix shape vary from a typical DNA double helix?
A) The double helix would be longer than normal. B) The double helix would be shorter than normal. C) One strand of the double helix would be longer than the other strand. D) The width of the double helix would vary along the length of the strand.
Which of the following enzymes is responsible for joining Okazaki fragments together?
A. ligase B. DNA polymerase C. primase D. helicase E. topoisomerase
Which of the following choices best summarizes the results of the experiment by Damschen and her
colleagues in the graph above?
a. Habitat patches with landscape corridors are at higher risk of encroachment by exotic species than isolated habitat patches are. b. Over time, the number of native species harbored by habitat patches with landscape corridors was increasingly greater than in isolated habitat patches. c. The number of both native and exotic species increased over time in habitat patches that were connected by landscape corridors. d. The number of native species increased over time in isolated habitat patches but not in those connected by corridors. e. The number of exotic species is greater than the number of native species.
In the 1920s, Otto Loewi discovered that
a. a frog heart would beat outside the animal. b. the nerve to a frog’s heart released a chemical that affected only that heart. c. neuron endings release a neurotransmitter when stimulated. d. a saline solution caused an isolated frog heart deprived of its own nerve supply to beat more slowly. e. ACh acts on skeletal muscle, smooth muscle, the heart, some glands, and the brain.