Which of the following is the best description of algae?
A. a heterotrophic protist
B. a chemotrophic protist
C. a heterotrophic prokaryote
D. a chemotrophic prokaryote
E. a photosynthetic protist
E
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Studying the transcriptional activity of flagellar genes would not likely reveal differential changes when the cells are actively motile compared to nonmotile activity, because a two-component regulatory system is sufficient to control flagellar activity
Indicate whether the statement is true or false.
Which organism would be classified as a chemoautotroph?
a. cactus b. lichen c. oak tree d. green algae e. nitrogen-fixing bacteria
Myasthenia gravis is a form of muscle paralysis in which _____
A) motor neurons lose their myelination and the ability to rapidly fire action potentials B) acetylcholine receptors are destroyed by an overactive immune system C) ATP production becomes uncoupled from mitochondrial electron transport D) troponin molecules become unable to bind calcium ions
A scientist performs a controlled experiment. This means that
A) the experiment is repeated many times to ensure that the results are accurate. B) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. C) two versions of the experiment are conducted, one differing from the other by only a single variable. D) one experiment is performed, but the scientist controls the variables.