The ____ are limited to three groups of proteobacteria
a. chemoautotrophs only
b. chemoheterotrophs
c. photoautotrophs
d. photoheterotrophs only
e. chemoautotrophs and photoheterotrophs
ANSWER: d
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Consider the HIV enzyme called protease. The amino acid residues at the active site are highly hydrophobic. In designing a drug that would bind to the active site and jam it, researchers should use a molecule that is _____
A) hydrophobic B) polar C) charged D) acidic
Reptiles dominated the:a
Proterozoic era. b. Paleozoic era. c. Mesozoic era. d. Cenozoic era. e. Triassic era
In eukaryotes there are several different types of RNA polymerase. Which type is involved in transcription of mRNA for a globin protein?
A) RNA polymerase I B) RNA polymerase II C) RNA polymerase III D) primase
If a person were stranded for two days with virtually no drinking water, you would expect the following to occur
A) a decrease in antidiuretic hormone (ADH) secretion B) production of dilute urine C) production of concentrated urine D) a decrease in aldosterone secretion