Like bacteria, yeasts grow easily in culture. But why are they regarded as more useful for recombinant DNA technology?
a. They are more stable in culture than prokaryotes because they are not prone to bacteriophages.
b. They are virtually harmless to humans so they are less risky to work with than prokaryotes.
c. Because yeasts are eukaryotic, they exhibit post-transcriptional mRNA editing not performed by any prokaryotes such as Escherichia coli.
d. They have longer lifespans so they do not have to be split and recultured as often.
c. Because yeasts are eukaryotic, they exhibit post-transcriptional mRNA editing not performed by any prokaryotes such as Escherichia coli.
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The protists are a diverse group of organisms that have traditionally been grouped together because
they all
a. have the same type of nutrition. b. live in the same environments. c. have very similar DNA sequences. d. have very similar shapes. e. are not prokaryotes, fungi, plants, or animals.
The function of triglycerides is
A) to store energy. B) to form semipermeable membranes. C) to transport substances in and out of cells. D) store information. E) Both B and C are correct.
The cells of plasmodial slime molds can grow to several centimeters in diameter because
A) they have organelles. B) they distribute nutrients by cytoplasmic streaming. C) the large surface can absorb nutrients. D) they form spores. E) they have a mouth to ingest nutrients.
Severe Acute Respiratory Syndrome (SARS)
A. is not highly transmissible. B. is caused by the respiratory syncytial virus. C. can cause high fever, pneumonia, respiratory distress. D. began with an initial outbreak in the United States and then spread to Canada and China. E. All of the choices are correct.