Nonpolar signal molecules enter the cell by ____
a. facilitated diffusion
b. simple diffusion
c. osmosis
d. active transport
e. receptor-mediated endocytosis
B
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The donor cell makes ___________ whose function is to bring F- cells close enough to transfer a ___________ to the recipient.
A. a sex pilus, single strand of DNA B. a sex pilus, double strand of DNA C. an F factor, fertility plasmid D. an F factor, replicated F factor E. a sex pilus, bacterial chromosome
In which phase of the cell cycle does eukaryotic DNA replication take place?
a. M phase b. G0 c. S phase d. R phase
In contrast to a G protein-linked receptor and an enzyme-linked receptor, a channel-linked receptor:a
is located on the cell surface. b. is composed of seven alpha helices. c. couples signaling molecules to signal transduction pathways. d. is a ligand-gated channel. e. functions as a tyrosine kinase.
A biological select agent spread by (aerosols/contact/ingestion) has a high threat level.
Fill in the blank(s) with the appropriate word(s).