What element is in the cell walls of grasses and horsetails, which gives them such a sharp, cutting edge, like a piece of glass?
a. carbon
b. silicon
c. chlorine
d. boron
e. nitrogen
B
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Which one of the following statements about IgM is false?
A) IgM contains a J-chain. B) IgM has a total of 10 antigen-binding sites. C) IgM is a pentamer. D) IgM is a long-lived molecule.
The prime mover of wrist extension is the __________.
a. extensor carpi ulnaris b. extensor carpi radialis longus c. extensor carpi radialis brevis d. extensor digitorum
Which of the following statements regarding the figure 7 below is true?
A) Immigration rates are higher on smaller islands. B) Species richness should be higher on larger islands near to the mainland. C) Species diversity should be highest on larger islands far from the mainland. D) Extinction rates are highest on large islands near to the mainland. E) B and C
Communities evolve to have greater biomass and species richness in a process called
A. succession. B. adaptive modifications. C. competitive exclusion. D. sympatric interactions. E. symbiotic relationships.