Eukaryotic mRNA has a significantly longer half life than its prokaryotic counterpart. How is this accomplished in
eukaryotes? What processes tend to degrade mRNA molecules in both eukaryotes and prokaryotes, and why are these
processes needed? What will be an ideal response?
Concepts to Consider: Eukaryotic mRNA is protected after it is made by the addition of a
poly-A tail and a cap. These additions protect the mRNA from degradation by nucleases that
target RNA. These nucleases are needed to degrade foreign RNA and DNA that enter the
cell.
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The binding of a neurotransmitter to ligand-gated Na+ channels will cause ____ in the postsynaptic membrane
a. depolarization only b. hyperpolarization c. repolarization only d. apolarization e. depolarization and repolarization
A taste bud is indicated by
a. A. b. B. c. C. d. A and B. e. none of these; they are olfactory receptors.
Calculate the acceleration of a 500,000kg jumbo jet just before takeoff when the thrust on the plane is 150,000N.
What will be an ideal response?
Which statements are true for chloroplasts?
a) They contain the green pigment chlorophyll. b) They are the sites of reactions that convert solar energy into chemical energy. c) Their inner membrane has infoldings called cristae. d) Their matrix contains enzymes that function in cellular respiration. e) They are the sites of reactions that convert chemical energy to ATP. f) They have membranous sacs called thylakoids that are surrounded by a fluid called stroma.