The hypothesis that states that eukaryotic organelles are derived from once free living prokaryotes is known as the:
a. prokaryote origins hypothesis.
b. organelle hypothesis.
c. hybrid hypothesis.
d. endosymbiosis hypothesis.
e. early life hypothesis.
D
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Electron microscopes have less resolving power than light microscopes
Indicate whether the statement is true or false.
Which of the statements in INCORRECT about the following reaction? Phosphoenolpyruvate + ADP ? Pyruvate + ATP (?G = -7.5 kcal/mole)
A. It is anabolic. B. It is catabolic. C. It can be used to drive an endergonic reaction. D. The synthesis of ATP occurs by substrate-level phosphorylation. E. It is a reaction that yields energy.
Beta-N-Methylamino-L-Alanine, or BMAA, is a glutamate receptor agonist produced by cyanobacteria. Since Glu is an excitatory neurotransmitter, it is not surprising that BMAA is associated with neurological damage. Buildup of BMAA in fruit bats was hypothesized to cause neurodegenerative disease in islanders that fed on the bats. A recent study found high levels of BMAA in sharks, suggesting that consumption of shark fin soup is also dangerous. The researchers suggested that a secondary effect of BMAA may actually make these hazardous foods surprisingly desirable. What might this be?
A. Since BMAA is a Glu receptor agonist, it promotes incorporation of Glu into proteins, and has health-promoting effects. B. Since BMAA is derived from cyanobacteria, it provides unique nutrients not found in the animal or plant kingdom. C. Since BMAA is a Glu receptor agonist, it imparts a strong umami flavor that makes food more delicious. D. Since BMAA contains alanine, it improves protein synthesis by providing this rare nutrient. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about glutamate? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Antimicrobials that block protein synthesis by binding to the mRNA are
A) aminoglycosides. B) antisense nucleic acids. C) macrolides. D) beta-lactams. E) nucleic acid analogs.