According to the modern theories on how life formed on Earth, prokaryotes are thought to have evolved before eukaryotes. Provide evidence to support that pattern of evolution based on the composition of the early Earth's atmosphere
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When the Earth formed, the atmosphere was hot and filled with many gases, but oxygen was not present. For most eukaryotes, key physiological and biochemical events (i.e., meiosis, metabolism) depend on high levels of oxygen, whereas most known prokaryotes either can function without oxygen or cannot tolerate it at all. This evidence argues that prokaryotes evolved when oxygen levels in the atmosphere were low or absent, and eukaryotes did not appear until oxygen was already present.
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Select the diseases caused by trypanosomes.
A. Leishmaniasis B. Giardiasis C. Trichomoniasis D. African Sleeping Sickness E. Chagas Disease
Which one of the following annelid structures or events is not correctly paired with its role in locomotion?
A. circular muscles contract—segment becomes thin and long B. longitudinal muscles contract—segment becomes thick and short C. fluid in coelom—provides a hydrostatic skeleton D. septum—allows each segment to move independently E. chaetae—provides gas exchange surface for body muscles
The pathogenicity of what virus is based on damage to the immune system?
a) HPV b) HIV c) HSV type 1 d) HSV type 2
A(n) (symport/antiport/uniport) is a carrier protein that transports two substances in the same direction across a membrane
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