Sister chromatids are
A) found immediately after a cell divides.
B) joined together at a centromere.
C) made only of DNA.
D) unique to prokaryotes.
Answer: B
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Steroid and thyroid hormones do not bind to membrane surface receptors because they ____
a. are small enough to pass directly through the membrane b. are soluble in the lipid bilayer c. pass through special membrane channels d. are water-soluble e. dissolve in the cholesterol present in cell membranes
Plasmodesmata are most similar to ____
a. gap junctions in animal cells b. tight junctions in bacteria c. basement membranes in animal cells d. adhering junctions in heart muscle e. both tight junctions in bacteria and adhering junctions in heart muscle
Which of the following is a habitat?
a. predator b. intestinal tract c. parasite d. producer e. decomposer
What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They change their conformation when bound to a hormone. B. They open ion channels. C. They bind similar hormones. D. They are all linked to protein kinase activation. E. They associate with a protein bound to GDP or GTP.