The snottites described in the case study at the beginning of this section are colonies of bacteria, extremophiles that have some unique requirements for life processes
For example, they use sulfur from the hydrogen sulfide in the environment to capture energy. Although most life forms you are familiar with, including humans, don't use sulfur for this purpose, we do use another element to do the same thing. Which element do humans use for this energy conversion? Carefully examine the periodic table.
A. carbon
B. nitrogen
C. hydrogen
D. oxygen
Answer D
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Sympathetic nerves have what effect on systemic arterioles?
A) vasodilation B) vasoconstriction C) vasospasm D) vasoconstriction and vasospasm E) neither vasodilation or vasoconstriction, but may cause vasospasm
Humans are an example of
A) chemoautotrophs. B) photoautotrophs. C) chemoheterotrophs. D) photoheterotrophs.
What is the primary purpose of a fruit?
A. to feed the growing embryo of the plant B. to reward animals for pollination C. to distract predators from the main plant D. to disseminate seeds
Enzymes are necessary for cells because
A) enzymes slow down chemical reactions that would otherwise occur too quickly to facilitate life. B) enzymes allow chemical reactions to occur under physiological conditions. C) enzymes allow chemical reactions to occur under physiological conditions and within a time frame conducive to life. D) enzymes allow chemical reactions to occur quickly enough to facilitate life. E) enzymes allow chemical reactions to take place that would otherwise be impossible.