All of the following are animal mechanisms to cope with the problem of water balance EXCEPT
A. secretion of regulatory hormones into the tubule.
B. coupling of water/salt removal with metabolic waste removal.
C. kidneys used as filtering organs.
D. contractile vacuoles.
E. passage of water and waste of the body across a layer of cells into a tubular structure.
Answer: A
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A certain gene is transformed into a plant cell for potential use as a vaccine delivery system. Upon performing a Northern blot, a good deal of mRNA for the gene is produced. However, the protein product for the gene is not observed. One explanation may be that the
A) plant cell recognizes and degrades the protein in the cytoplasm. B) plant ribosomes are not recognizing the mRNA translational initiation sites. C) mRNA is not stable in the plant cytoplasm. D) all of the above E) none of the above
Which of the following is the most likely source of mitochondria?
a. aerobic bacteria b. pathogenic prokaryotes c. phototrophs d. plastids
What is part of the initial response to hot temperature?
a. widespread vasodilation in skin b. shivering c. increased respiration d. shunting of the blood to the core regions of the body e. increased metabolism
In reference to diseases, the naturak host or primary habitat of a pathogen is referred to as its ______
Fill in the blank(s) with the appropriate word(s).