Answer:
Lipids and proteins
Explanation:
It gets lipids from the membrane of the host cell it attaches to.
The proteins on the envelope are from the original virus itself.
Explanation:
cAMP binds to protein kinase A and activates it, allowing PKA to phosphorylate downstream factors to produce a cellular response. cAMP signaling is turned off by enzymes called phosphodiesterases, which break the ring of cAMP and turn it into adenosine monophosphate (AMP).
Earth's atmosphere helps maintain a constant temperature.
