Which of the following does not contribute to the efficiency with which E. coli RNA polymerase binds to a promoter?
A. the sequence of the upstream promoter element
B. the binding of a sigma subunit
C. the sequence at the +10 region
D. the sequence at the -35 region
E. the distance between the consensus sequence and the transcriptional start site
C
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The simplest living animal is the ________
a. cnidarian b. placozoan c. sponge d. flatworm
The trachea is completely surrounded by rings of cartilage, resulting in an organ that is inflexible
Indicate whether the statement is true or false
Which cells form flexible support strands such as the "strings" in celery?
a. sclerenchyma cells b. tracheids cells c. collenchyma cells d. parenchyma cells
The following statements regarding INNATE immunity are true, EXCEPT
A. It is prepared to block the entry of microbes B. This type of host defense is always present in healthy individuals C. Rapidly eliminate microbes that succeed in entering host tissues D. It relies on antibody formation and cell-mediated immunity to achieve its functions