Which of these causes decreased blood pressure?
A. secretion of ADH
B. secretion of renin
C. secretion of aldosterone
D. secretion of atrial natriuretic factor
E. sympathetic stimulation of kidney blood vessels
Answer: D. secretion of atrial natriuretic factor
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Which of the following correctly describes the long-term responses of populations following the fire? a. The grasses eventually declined back to their original size and the other populations graduallygrew back to their original sizes
b. The grasses eventually grew back to their original size and the other populations eventuallydeclined back to their original size. c. All populations eventually declined. d. All populations eventually increased.
Sequence A in Figure 1-1 represents:
a. a hypothesis.
b. the experimental group.
c. the control group.
d. a sampling error.
e. a deduction
Which statements are true of receptor mediated endocytosis?choose one or more
A.) it allows the internalization of extracellular substances in clathrin coated vesicles B.) the process can be hijacked by viruses to gain entry into cells C.) interalized endocytic vesicles fuse with lysosomes, which can return empty receptors to the plasma membrane D.) it allows cholesterol carrying low density lipoproteins (LDLs) to be taken up by cells E.) it allows hemoglobin to be taken up by immature red blood cells
Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. D. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade. E. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time.