Freshwater fish must excrete ______ and actively accumulate _______
a. water; urea
b. urea; water
c. salt; urea
d. water; salt
e. urea; water
D; Freshwater fish accumulate water by osmosis. They excrete this as dilute urine, losing some salt in the process. They regain the salt by active transport in the gills.
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a. ER ribosomes. b. free cytosolic ribosomes. c. organellar ribosomes. d. Both b and c
Strategies to fight HIV include
A. inhibition of the reverse transcriptase enzyme. B. inhibition of virus assembly. C. prevention of HIV entering healthy cells. D. prevention of other infections. E. a combination of all of the above.
The California newt is found only in California. This is an example of a(n) ________ species
A) ubiquitous B) metapopulation C) endemic D) invasive
In Griffith's experiment involving the transformation of Streptococcus pneumoniae,
A) the R strain was virulent. B) the S strain was virulent. C) both the R and S strains were virulent. D) the R strain had a protein capsule. E) the S strain had a protein capsule.