What is the purpose of the pulmonary circuit in a closed circulatory system?
a. to collect and distribute blood only to the heart
b. to take blood to and from all parts of the body
c. to take blood to and from the lungs
d. to take blood to and from kidneys
Ans: c. to take blood to and from the lungs
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Using the flow chart, starting with the heart
and going in order 1?5, which is the correct order of blood flow?
a. capillaries, venules, veins, arteries, arterioles b. arterioles, arteries, venules, veins, capillaries c. arteries, arterioles, capillaries, venules, veins d. veins, venules, capillaries, arterioles, arteries e. arteries, veins, arterioles, capillaries, venules
As predators feed on prey, prey abundances decrease over time. This is predicted to result in a(n)
A) increase in predator abundance. B) decrease in predator abundance. C) no change in predator abundance. D) increase in predator size.
A pollen grain is a(n) ________
A) female gametophyte B) sporophyte C) male gametophyte D) integument
Which of the following is (are) NOT characteristic(s) of the pathways activated by second messengers?
a) Each signaling pathway consists of a series of distinct proteins that operate in sequence. b) Some phosphatases and protein kinases in the pathway have numerous proteins as their substrates; others act on only a single protein substrate or a single amino acid of a protein substrate. c) Alterations in the conformations of signaling proteins are often accomplished by protein kinases and protein phosphatases that, respectively, add or remove phosphate groups from other proteins. d) Each protein in the pathway typically acts by altering the conformation of the previous (upstream) protein in the series, an event that activates or inhibits the protein.