The Arctic tern makes an annual migration of up to _______
a. 700,000 km
b. 70,000 km
c. 7,000 km
d. 700 km
e. 70 lm
B
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Most seagrasses add nutrients into the marine food chain via
a. DOM. b. detritus. c. herbivory. d. marine geese. e. mucus.
Where does a dendritic cell present antigen to naive T cells?
a. thymus b. blood c. bone marrow d. lymph node or spleen e. interstitial fluid
Cotransductant bacteria can occur if
A) a bacterial cell picks up two fragments of DNA from the environment, each with a different gene. B) double crossover occurs between prophage DNA and the bacterial chromosome. C) two genes are closely linked enough so that they can be packaged into a phage head and injected into a cell by a single phage. D) two genes are introduced into the same bacterium by simultaneous infection with two different phages. E) Both C and D
Acids have a high _____ concentration
Fill in the blank(s) with the appropriate word(s).