Virulent (lytic) phages:a
infect viruses.
b. destroy bacteria.
c. infect but do not destroy bacteria.
d. infect virions.
e. infect prions.
B
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Sometimes a prokaryotic activator protein interacts with a small molecule in the cell and undergoes a change in shape that alters its affinity for binding to DNA. This change in shape is an example of an ____ effect
Fill in the blank with the appropriate word.
Two 6-base sequences are present in bacterial promoters: TATAAT (located 10 nt upstream from the start site) and TTGACA (located 35 nt upstream from the start site). What is the significance of the fact that these two base sequences are different?
A. Binding sites for both the holoenzyme and ATP are provided. B. It allows RNA polymerase to distinguish between the template strand and the coding strand of the DNA molecule. C. The transcription bubble can be properly formed. D. Binding sites for both the core polymerase and holoenzyme are provided. E. Both the location of the start site and the direction of transcription can be established.
In which of the following scenarios is kin selection least important?
A. Many female animals have evolved to produce nutrient-rich secretions that they use to feed their young B. Vampire bats will quickly die without feeding, but they aren't always successful in finding a meal. However, unsuccessful bats ask for and usually receive regurgitated blood from successful members of their roosting group C. Belding's ground squirrel females stay in the same population from birth while males tend to disperse to other groups, females tend to make alarm calls more often than males D. Eusocial animals evolve sterile worker castes
`Please select all of the statements which are TRUE regarding isolated colonies.
> The colony results from a single cell or a cluster of cells multiplying into a visible mass > The cells within the colony are all the same species > Isolated colonies form on a solid nutrient media > Isolated colonies form in a liquid nutrient media > Isolated colonies can only be obtained via the streak plate method