Binding of a protein hormone may lead to formation of a __________, which relays a signal into the
cell. Fill in the blank(s) with the appropriate word(s).
second messenger
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True or false: Niche and habitat have the same meaning
A. true B. false
Plant proteins generally are missing some vital amino acids. They are therefore called ________
Fill in the blank(s) with correct word
What is the difference in the bonding between alpha-helix and beta sheets?
A. Sulfur bridges allow the spring like turns in alpha helices and van der Waals dispersion allows the folds in beta sheets. B. Hydrogen bonding between the amides only occurs in one of these two types of secondary structures. C. Hydrogen bonding always occurs in the alpha helices but only occurs in parallel beta sheets. D. Hydrogen bonding occurs between the amides of adjacent chains in the sheets instead of between the amides in different parts of the helices.
Smooth muscle propels food through the alimentary canal by a process called
A) ingestion. B) digestion. C) elimination. D) peristalsis.