The positively charged component of the atom is the
A. electron.
B. neutron.
C. proton.
D. quark.
C
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Following a disturbance, the process by which species replace each other over time is called ____
Fill in the blank with the appropriate word.
The mechanism of phase variation in Salmonella typhimurium:
A. uses site-specific recombination to invert the fljA and fljB genes so they now are not contiguous with their promoter. Expression of these genes is now prevented. B. uses site-specific recombination to invert the fljA and fljB promoter, preventing transcription of the two genes. Without repressor the fljC protein is now expressed. C. uses site-specific recombination to delete the repressor, fljA. Without repressor the fljC protein is now expressed. D. uses site-specific recombination to delete the fljB gene so only fljC can be expressed. E. None of the choices given is true.
According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then activates ____ that
disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.
a. a membrane potential b. AUX1 transporters c. proteins called expansins d. an mRNA e. K+ ions
Coral diversity is greatest in the Caribbean
Indicate whether the statement is true or false