Which one of the following characteristics is true of all viruses? (Choose all that apply)
A. They contain a DNA genome.
B. They must infect a host cell to reproduce.
C. They have a protein coat called a capsid.
D. They are surrounded by a lipid envelope.
B,C
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When epidermal growth factor binds to its _____________, the receptor phosphorylates itself, triggering a signal transduction pathway.
A. thermoreceptor B. G-protein coupled receptor C. mechanoreceptor D. ligand-gated ion channel receptor E. enzyme-linked receptor
Which of these molecules breaks down proteins in the stomach?
a. pepsinogen b. hydrochloric acid c. pepsin d. amylase
The citric acid cycle starts with ________ and yields ___________.
Fill in the blank(s) with the appropriate word(s).
Once an organism is assigned to a particular taxonomic hierarchy, it is permanent and cannot be revised.
Answer the following statement true (T) or false (F)