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.
You might also like to view...
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.
Mitochondrial and chloroplast proteins are synthesized on
a. ER ribosomes. b. free cytosolic ribosomes. c. organellar ribosomes. d. Both b and c