Pick the statement that is false.
a. Transcriptional regulation is the most common mechanism of control in prokaryotes.
b. An Oc mutation on the bacterial chromosome can affect the expression of structural genes on a F plasmid.
c. Premature termination of the trp operon occurs in the presence of tryptophan charged tRNAtrp.
d. Repressible operons typically control enzymes in anabolic pathways.
e. Operator regions are often located between the promoter and structural genes they regulate.

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

Why do we perceive objects as retaining their brightness under different lighting levels?