An example of mechanical isolation would be
a. flowers that bloom months apart.
b. two organisms that are pollinated by different insects.
c. two organisms that have different habitats.
d. two organisms that have incompatible gametes.
e. two organisms that have different mating rituals.
B
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Which of the following is a fairly reliable method of characterizing strains of S. aureus?
A. Complement fixation B. Protein fingerprint C. Genome typing D. LPS pattern
Regardless of its shape, a given orbital may contain no more than:
A. 1 electron. B. 4 electrons. C. 8 electrons. D. 2 electrons.
One of the three internal cell cycle checkpoints occurs during ____ and monitors ____
a. the G1/S transition; mitotic spindle integrity b. late S phase; the presence of DNA damage c. the G2/M transition; the presence of DNA damage d. the G2/M transition; mitotic spindle integrity e. anaphase; the presence of DNA damage
A tomato plant is mutated with gamma radiation. A cellular analysis reveals that ATP synthase complexes found in the thylakoid membrane are inserted backwards into the membrane. What is the most likely outcome of this error?
A. The ATP synthase will pump protons into the stroma in this orientation. B. The proton gradient in the thylakoid space will not be able to be used to generate ATP. C. The thylakoid membrane will become permeable to protons as a result of this change. D. A proton gradient will not be established in the thylakoid space in response to the activation of photosystem II. E. This change is not likely to have any effect on the function of the ATP synthase enzyme with respect to its role in photosynthesis.