Explain why choanoflagellates are thought to be of particular evolutionary importance. What will be an ideal response?
Concepts to Consider:It
is hypothesized that choanoflagellates are the closest nonanimal relative to animals.
Choanoflagellates have a striking resemblance to collar cells in sponges. Other animal phyla,
such as cnidarians, flatworms, and echinoderms, also contain choanoflagellate-like cells, but
no other group of protists has been observed to possess these cells. Evidence supporting the
close relationship between choanoflagellates and animals includes comparative DNA
sequence data of mitochondrial and nuclear genes
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Which of the following are formed during the dissociation of carbonic acid as it occures in the tissue capillaries.
A) Water B) Bicarbonate ions C) Hydrogen ions D) Cardon dioxide
Light reactions use ATP as energy source The light reactions use ATP as the energy source.
a. true b. false
Why are neocallimastigomycetes being studied for biofuel production?
A. They can ferment glucose into alcohol. B. They can generate methane. C. They provide energy to power fermentation. D. They can release fermentable sugars from structural polysaccharides. E. They can extract pollutants from biofuel starting materials.
A type of ecosystem characterized by bioluminescent creatures eating debris can be found
A. at the open ocean surface. B. in shallow waters overlying the continental shelves. C. in the deep-sea waters, below the level of light penetration. D. in estuaries.