The formation of amino acids under abiotic
conditions was important because they serve as
a. a supply of structural units for proteins.
b. enzymes to catalyze reactions.
c. subunits in the formation of DNA.
d. subunits in the formation of RNA.
e. subunits for the formation of lipids.
Answer: a
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A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host. Which of the following procedures would best test the researcher's hypothesis?
A. Design a method to isolate the bacteria from the insect, then mutate the bacteria in the region of DNA that controls vitamin production and compare growth of the mutant and wild-type bacteria on minimal media B. Extract the DNA from the bacteria and from the insect, then use reverse-transcriptase PCR and primers specific to the gene that controls vitamin synthesis to compare transcription of RNA in both organisms C. Determine which insecticide kills the insect without harming the bacterial host, then compare vitamin production by the bacteria from insects treated with the insecticide to those from untreated insects D. Determine which antibiotic kills the bacteria without harming the host, then administer this antibiotic to the insect and compare its growth with and without the vitamin
These are responsible for cell shape, internal organization, and movements
a. ribosomes b. cytoskeleton c. vesicles d. Golgi bodies e. endoplasmic reticulum
What mode of nutrition would you predict that a prokaryote would use if it is placed in an aquatic environment that has moderate sunlight availability as well as dead plant material?
A) photoautotrophic behavior B) chemotrophic behavior C) mixotrophic behavior D) chemoautotrophic behavior
If Georgina takes a drug that increases the effects of norepinephrine, what changes would we see in the basic activities of her body?
What will be an ideal response?