The antibiotic chloramphenicol binds to the 50S subunit of the ribosome as shown in Figure 20.3. The effect is to
a. Prevent attachment of tRNA.
b. Prevent peptide bond formation.
c. Prevent transcription.
d. Stop the ribosome from moving along the mRNA.
e. Prevent polypeptide formation in eukaryotes.
Ans: a. Prevent attachment of tRNA.
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Astrobiology is considered a sub-discipline of microbiology because
A. microbes are known to exist on other planets. B. all extraterrestrials known are microbial. C. life elsewhere in the universe is likely to be microbial. D. only microbes can reproduce under the extreme conditions in outer space.
The influenza viruses that infect man usually are derived from a type that could also infect:
a. Horses and sheep b. Cattle and water buffalo c. Chimpanzees and gorillas d. Birds and pigs e. A variety of primates
Which of the following is an example of a positive feedback mechanism?
a. increase in body temperature when exposed to cold b. increased muscle contractions during labor c. decreased insulin production in response to low blood sugar d. increased respiration rate in response to decreased blood pH e. Both choices A and B are correct.
You have been assigned to analyze some extraterrestrial material recently collected from Mars. After examining a sample using a microscope you jump up excitedly and shout to your colleagues that you have confirmed the existence of life on Mars. One of your colleagues takes a look at your sample and remarks that all he sees is a single-celled "blob" with little internal structure. Assuming that life on Mars can be classified into similar domains and kingdoms as Earth, to which domain does your "blob" belong?
A. Protista B. Animalia C. Archaea D. Fungi