Biology, 06.11.2019 23:31 belle200163
Alarge proportion of archaeans are extremophiles, so called because they inhabit extreme environments with high acidity, salinity, and/or temperature. such environments are thought to have been much more common on the primitive earth. thus, modern extremophiles survive only in places that their ancestors became adapted to long ago. which of the following is, consequently, a valid statement about modern extremophiles, assuming that their habitats have remained relatively unchanged? a) on a phylogenetic tree whose branch lengths are proportional to the amount of genetic change, the branches of the extremophiles should be shorter than the non-extremophilic archaeans. b) they should contain genes that originated in eukaryotes that are the hosts for numerous species of bacteria c) among themselves, they should share relatively few ancestral traits, especially those that enabled ancestral forms to adapt to extreme conditions. d) they should currently be undergoing a high level of horizontal gene transfer with non-extremophilic archaeans.
Answers: 3
Biology, 21.06.2019 19:00
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Biology, 21.06.2019 21:00
Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria
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Biology, 22.06.2019 08:00
Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?
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Alarge proportion of archaeans are extremophiles, so called because they inhabit extreme environment...
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