Gram-positive bacteria have __________ and appear
__________ under the microscope.
a. thick walls; pink
b. thick walls; purple
c. thin walls; pink
d. thin walls; purple
e. none of these
Answer: b
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Which of the following is not true of viroids?
A. Viroid RNA does not serve as mRNA nor does it direct the synthesis of mRNA. B. Viroids are small circular ssRNA molecules. C. Viroids have no protein capsids. D. Extracellular viroids have a lipid bilayer envelope.
Imagine you are talking to your friend who is very excited because he has just transduced his first batch of bacteria in the laboratory. What does this mean?
A. He introduced a gene of interest into his bacteria using viruses. B. He introduced a gene of interest into his bacteria using other bacterial species that can form pili. C. He introduced a gene of interest into his bacteria by lysing other bacterial cells and exposing his bacteria to this mixture. D. He produced a strain of antibiotic-resistant bacteria by exposing his bacterial cultures to antibiotics. E. Through periodic selection, he was able to isolate a gene of interest in his bacteria.
The European Neanderthals were replaced about 34,000 years ago by
A. Homo habilis. B. Homo erectus. C. Homo heidelbergensis. D. Neanderthals. E. Cro-Magnons.
In female humans, what is the function of LH?
a. it stimulates the releases of GnRH from the adrenal cortex b. it stimulates the maturation of ovarian follicles c. it stimulates cells in the follicle to secrete estrogens d. it encourages the completion of meiosis I and cytoplasmic division e. LH functions to do more than one of these