The levels of potassium and sodium in the body are regulated primarily by the hormone aldosterone
Indicate whether the statement is true or false
TRUE
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Microorganisms were probably restricted to the oceans and subsurface environments until
A) aquatic life brought them onto land. B) chemoorganotrophy developed. C) phototrophy evolved. D) the ozone layer was made.
Bacteriochlorophyll differs from chlorophyll a and b in structure and function. Which of the following statements correctly contrasts these types of chlorophyll?
A) Bacteriochlorophyll has a porphyrin ring, whereas chlorophyll does not. B) Chlorophyll has a phytol side chain, but bacteriochlorophyll does not. C) Chlorophyll has a methyl group attached to the porphyrin ring, whereas bacteriochlorophyll has a formyl group. D) Bacteriochlorophyll has a saturated carbon-carbon bond at one location in the porphyrin ring, whereas chlorophyll does not. E) both choices A and D correctly contrast these types of chlorophyll.
Mutants that are lacIS do not produce lac enzymes, regardless of the presence or absence of lactose
Indicate whether the statement is true or false
One way embryonic cells can learn their position in an embryo is by detecting the concentration of a
A. morphogen B. DNA polymerase C. gene (segment of DNA) encoding a transcription factor