Primary plant cell walls are cross-linked by
a. hemicellulose.
b. lignin.
c. pectin.
d. chitin.
Ans: a. hemicellulose.
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The natural habitat of L. pneumophila is:
a. freshwater streams. b. the upper respiratory tract of humans and animals. c. the large intestine of humans and animals. d. foods contaminated by soil.
In lichens, the fungi send projections of their hyphae across the algal cell wall in order to obtain nutrients from the photosynthetic partner. These projections are called
A. hyphal extensions. B. lichenthropes. C. haustoria. D. mycelia.
Most of the carbon dioxide released by cells is transported in the venous supply in what form?
A) free carbon dioxide gas B) oxyhemoglobin C) soluble bicarbonate ion D) bound to hemoglobin E) carbon monoxide
How does DNA polymerase differ from RNA polymerase?
A. Only DNA polymerase uses a template DNA strand to direct synthesis of a new nucleotide strand. B. Only DNA polymerase has a proofreading ability. C. Only RNA polymerase requires a primer. D. Only RNA polymerase adds new nucleotides to the 3' end of a growing chain.