What ecological roles do seagrasses play?
a. Humans use the stems of seagrasses for various purposes
b. They contribute 10% of oceanic primary production.
c. They resuspend sediments into the water column.
d. They stabilize sediments.
d
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Functions of the mantle in clams include
(a) secreting the shell. (b) forming pearls around irritating grains of sand. (c) forming the incurrent and excurrent siphons. (d) all of the above.
Site-specific recombination occurs between homologous sequences of DNA
Indicate whether the statement is true or false
During the passage of a nerve impulse all of the following occur EXCEPT
a. sodium ions pass through gated channels. b. positive feedback causes more sodium ions to enter the cell. c. the interior of the cell becomes positive. d. changing voltage increases the number of open gates. e. changing voltage decreases the number of open gates.
Medicine must respond with new drugs and vaccinations to the slow evolution of disease-causing organisms such as
bacteria and viruses. __________________ Indicate whether the statement is true or false.