Leghemoglobin, which contains an iron-containing heme group, is used to
a. remove O2 from roots.
b. produce H2O from O2.
c. deliver O2 to bacteroids.
d. transport O2 in the xylem.
e. produce O2 from H2O.
C
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In all multi-celled fungi, reproduction begins with ____
a. fusion of male and female gametes b. budding from diploid fruiting structures c. hyphal fragmentation d. fusion of gametophytes e. fusion of haploid hyphae
Both aquatic and terrestrial organisms must have __________ across which gas exchange can take
place. a. a respiratory system b. tracheal tubes c. gills and lungs d. stratified squamous epithelial tissue e. a moist surface
Which factors are an example of a negative feedback system?
a. density dependent b. density independent c. intraspecific competition d. interspecific competition e. scramble competition
A plant, by opening and closing its stomata, must achieve a balance between
A) water loss and carbon dioxide uptake. B) oxygen loss and water uptake. C) sugar loss and oxygen uptake. D) carbon dioxide loss and sugar uptake. E) carbon dioxide uptake and oxygen loss.