Name the supergroup and representative “protist” clade to which choanoflagellates belong. Why are
the choanoflagellates thought to be particularly important evolutionarily? What will be an ideal response?
The choanoflagellates belong to the unikont supergroup and the opisthokont clade. They are thought to
be the closest living nonanimal relative of the animals.
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Molecules made primarily of carbon and hydrogen are called hydrocarbons. How many hydrogen atoms are present in each of the following molecules?
A five-carbon hydrocarbon molecule with four of the carbons linked by a single covalent bond, and with the fifth carbon attached by a single bond as a branch to the second carbon in the chain? A. 6 B. 8 C. 10 D. 12
The central dogma of molecular biology states that information flows from:
A. DNA directly to proteins. B. protein to RNA to DNA. C. DNA to RNA to protein. D. RNA to protein to DNA. E. RNA to DNA to protein.
Chronic smoking can lead to the formation of scar tissue in the lungs, permanently damaging alveoli. What condition results from this process?
A) bronchitis B) asthma C) emphysema D) lung cancer
Which examples would be considered different species under the biological species concept? Check all that apply.
A. Two plant species with no gene flow between them. B. Two bear species are able to breed in zoos, but have separate ranges in nature. C. Two tree species have different leaf shapes, but form hybrids in their overlapping ranges. D. Two skunk species look morphologically similar, but are unable to interbreed. E. Two snake species look different, but often form fertile hybrids.