In fish, blood flows in a direction opposite to the flow of water over the gills in a process known as:
a. concurrent exchange.
b. countercurrent exchange.
c. crosscurrent exchange.
d. exhalation.
e. diffusion.
b
You might also like to view...
In humans, the egg provides the mitochondria to the zygote. In plants, which organelles would be provided by the egg and not by the sperm?
A. nuclei and chloroplasts B. chloroplasts and mitochondria C. nuclei D. mitochondria E. chloroplasts
When molecules are broken apart in respiration,
a. the heat produced is used to drive biological reactions. b. the oxygen in the compounds that are broken apart is used as an energy source. c. the energy released is channeled into molecules of ATP. d. ATP is converted into ADP. e. ADP is released as a waste product.
If the DNA triplets are ATG-CGT, the tRNA
anticodons are a. AUG-CGU. b. ATG-CGT. c. UAC-GCA. d. UAG-CGU. e. all of these.
A difference between an acid and a base is that
A. acids are harmful and bases are not. B. acids release hydroxide ions and bases release hydrogen ions. C. acids have a high pH value and bases have a low pH value. D. acids have a low pH value and bases have a high pH value.