The function of a second messenger system is to ________.
Fill in the blank(s) with the appropriate word(s).
Answer: amplify the response of the first messenger
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All mammals develop a placenta, which provides for exchange of nutrients and wastes
between mother and offspring.
a. True, by definition, mammals have placentas. b. False, some mammals produce eggs. c. True, all mammals have amniotic eggs. d. False, not all mammals nurture their young
________ convert nitrogen from nitrates to N2
A) Nitrifying bacteria B) Nitrogen-fixing bacteria living in the soil C) Denitrifying bacteria D) Nitrogen-fixing bacteria living in the root nodules of legumes
A major function of the mitochondrial inner membrane is the conversion of energy from electrons to the stored energy of the phosphate bond in ATP. To accomplish this function, the inner mitochondrial membrane must have all of the following features except
A) carrier proteins to accept electrons from NADH. B) integral, transverse ATP synthase. C) proton pumps embedded in the membrane. D) the electron transport chain of proteins. E) high permeability to protons.
One hypothesis explaining animals' abilities to detect a magnetic field and use it to navigate is that sensory cells detect electrical fluctuations influenced by Earth's magnetic field. Which evidence, if it were true, would support this hypothesis?
A) Sensory cells of an organism known to use magnetic fields to navigate show an increase in action potential firing when in the presence of electrical fluctuations. B) Sensory cells of an organism known to use magnetic fields to navigate show a decrease in action potential firing when in the presence of electrical fluctuations. C) Sensory cells of an organism known to use magnetic fields to navigate show a greater density of negative ions on the outside of its plasma membrane. D) Sensory cells of an organism known to use magnetic fields to navigate produce greater amounts of enzymes sensitive to electrical fluctuations.