Which is false regarding the GGC gene?
a. It is present in humans, mollusks, and
insects.
b. It codes for an enzyme that regulates
pattern formation in cone shells.
c. It is more than 500 million years old.
d. Today the enzyme product of the gene has
different functions in different lineages.
e. None of these are false
B
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What term is used to describe bacteria that can only live in the absence of oxygen?
a. aerobes b. anaerobes c. oxyphiles d. oxyphobes e. methanogens
Many antibiotics kill bacteria because they hinder translation by prokaryotic ________.
A. cytoskeleton B. ribosomes C. nucleoids D. cytoplasm E. capsules
Imagine that you fill a shallow tray with water and place a drop of red ink in one end of the tray and a drop of green ink in the other end. Which of the following is TRUE at equilibrium?
A) The concentration of each ink is higher at one end of the tray than at the other end. B) No predictions can be made without knowing the size of the ink molecules. C) The red and green inks are both uniformly distributed throughout the tray. D) The red ink is uniformly distributed in one half of the tray, and the green ink is uniformly distributed in the other half of the tray. E) The red and green ink do not mix at all.
Four of the following are major features of arthropods. Which is the exception?
A. Jointed appendages B. Exoskeleton C. Paired segmental nephridia D. Specialized segments that are fused together E. Specialized sensory structures