In male bighorn sheep, the dominant male is usually the one with the largest horns
Indicate whether the statement is true or false
TRUE
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Blood vessels that return blood from capillaries back to the heart are
(a) arteries. (b) veins. (c) portal veins. (d) arterioles
A patient has a staphylococcal infection of the blood; a septicemia - very serious and possibly deadly. As the doctor, you would like to prescribe a relatively non-toxic and inexpensive drug out of the cephalosporin family. However, if the patient harbors a strain of Staphylococcus that is resistant to a variety of antibiotics, you would prefer to use vancomycin-- which is highly effective against Staphylococcus. Which of the following explains why the cephalosporin drug is preferred for use over the vancomycin?
A. Vancomycin is very toxic, and the Staphylococcus strain could become resistant leaving no back-up drugs with which to treat the infection. B. You really do not know that much about vancomycin, so you would rather go with a drug that you can find out more about. C. You would rather give an inexpensive drug to save the family money. D. Vancomycin is one of the most selectively toxic drugs there is, so you would prefer one that has a more broad-spectrum effect.
Using hair as the derived trait, which does not
fit the clade? a. whale b. crocodile c. wolf d. elephant e. tiger
In prokaryotes, the RNA polymerase holoenzyme consists of
A. the core polymerase plus two alpha subunits, two beta subunits, and a sigma subunit. B. two alpha subunits, two beta subunits, and two sigma subunits. C. the core polymerase plus a sigma subunit. D. the core polymerase plus two beta subunits. E. the core polymerase plus two alpha subunits.