Chickenpox and measles are both acquired by the respiratory route
Indicate whether this statement is TRUE or FALSE.
TRUE
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A microbial population can contain several microbial communities
Indicate whether the statement is true or false.
Why do you think it was important to have all experiments start with guppies from both stocking tanks rather than just one of the stocking tanks? a. Stocking from both tanks is the only way to ensure enough guppies were presentfor robust data analysis
b. Because selection can only operate on alleles that are present in the population,using guppies from both stocking tanks ensured that the full range of alleles inthe natural population were also present in the experimental tank. c. It was not important to have all experiments start with guppies from both stockingtanks.
Many amphibians now face extinction, and one cause is believed to be a(n) __________ fungus.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true of the mechanism of transcription attenuation of the trp operon?
A. The leader peptide mechanism is analogous to a repressor protein. B. The ribosome stalls at the adjacent Trp codons when the levels of tryptophan in the cell are high. C. The stalling of the ribosome at region 1 of the leader sequence inhibits the formation of the terminator structure. D. When sequences 2 and 3 of the leader sequence associate, transcription is terminated prematurely.