The ________ drift up to the stratosphere, where UV radiation causes them to break down to their atomic form, one of which breaks down ozone
Fill in the blank(s) with correct word
chlorofluorocarbons
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In order for a cell to respond to the signaling molecule epinephrine, it must have ____
a. ion channels b. a lipid bilayer through which epinephrine can pass
c. receptors with an epinephrine binding site on the cytoplasmic side of the plasma membrane d. receptors with an epinephrine binding site on the plasma membrane surface e. nuclear membrane receptors
Treponema pallidum
A. can cross the placenta. B. has a hooked tip to attach to epithelium. C. is transmitted by direct sexual contact. D. has humans as the sole reservoir. E. All of the choices are correct.
Four of these statements are true about the structure in the image above. Which statement is FALSE?
a. It is used for reproduction. b. It is used for gas exchange. c. It is used for water conservation. d. It extends across the cuticle. e. It is a stoma.
Microbes called the group I archaea or mesophilic Crenarchaeota that were found to oxidize ammonia in marine environments are now placed in the phylum ________.
A. Crenarchaeota II B. Euryarchaeota C. Thaumarchaeota D. Korarchaeota