All bacteria have a cell membrane
a. true
b. false
Answer: a. true
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The current theory is that chloroplasts are descendants of symbiotic cyanobacteria that lived within eukaryotic cells. If we look at their respective genomes, however, we see that the cyanobacteria have many more genes than do chloroplasts
Where did these genes go? A. Restriction enzymes removed them. B. Endosymbiosis requires a reduction in genetic material in order to be successful. C. Many of them were transported to the nucleus, and others were lost. D. Nowhere. Cyanobacteria and chloroplasts actually have the same number of genes. E. None of the answers options is correct..
Which of the following is not a characteristic of aquaporins?
a. They are transmembrane proteins. b. They facilitate the rapid transport of water through the plasma membrane. c. They are located in mammalian kidney tubules. d. They respond to specific hormones. e. They cause dehydration.
In the mechanics of conjugation, exclusive of gene transfer, Hfr and F+ strains behave the same.
Answer the following statement true (T) or false (F)
The least common type of polio is
A) nonparalytic polio. B) an asymptomatic infection. C) minor polio. D) paralytic polio. E) postpolio syndrome.