Which of the following characteristics of the lactose operon is not true of the galactose operon?
A. Repressor binding prevents RNA polymerase from binding to the promoter.
B. CRP activates expression when bound to cAMP.
C. Expression is high when glucose levels are low and the activating metabolite is present.
D. Expression is low when glucose levels are high.
A
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All apicomplexans are nonmotile, spore forming, and live as __________ in animals.
Fill in the blank(s) with the appropriate word(s).
There is no easy way to test for pathogens such as
Select one: a. Listeria. b. Salmonella. c. E. coli O157:H7. d. Norovirus.
Which of the following identifies a group of DNA viruses?
a. retroviruses b. herpesviruses c. paramyxoviruses d. filovirus e. picornaviruses
A population of 1,000 birds exists on a small Pacific island. Some of the birds are yellow, a characteristic determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of
the birds from this population. Only 10 remain, and those birds all have yellow feathers. Which of the following statements is true? A) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds. B) The hurricane has caused a population bottleneck and a loss of genetic diversity. C) This situation illustrates the effect of a mutation event. D) The 10 remaining birds will mate only with each other, and this will contribute to gene flow in the population.