Nearly all ecosystems receive a constant input of energy from ____
a. bacteria
b. biomass
c. nutrients
d. plants
e. the sun
ANSWER: e
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A gram-positive bacillus identified as Lactobacillus is isolated in large quantities from the urine of a 16-year-old female. Based on this information, the patient should receive which antibiotic?
a. Penicillin b. Tetracycline c. Vancomycin d. No antibiotics should be administered.
The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but their mating calls sound very different. Based on this, what is the best explanation for why these frogs are considered separate species?
A. They are too morphologically different to interbreed. B. They have undergone behavioral isolation which prevents them from interbreeding. C. They have undergone habitat isolation because one species is entirely terrestrial while the other is entirely aquatic. D. They do interbreed, but produce sterile hybrids.
Why is it useful to know the structure of a ribozyme when trying to understand a particular ribozyme's
function?
a. The way the RNA folds determines the activity of the ribozyme. We need to understand the structure in order to measure the rate of the reaction. b. It is not very useful at all; it is just a matter of curiosity. c. We need to know the structure in order to develop drugs that destroy that structure and prevent HIV infection. d. We need to be able to determine if an RNA molecule is a ribozyme or not. The only way to do that is to determine the structure. e. The way the RNA folds relates to the function of the ribozyme. If we can figure out the relationship, we might be able to develop new ribozymes that act as therapeutic agents.
During chemiosmosis, what must be transferred from NADH and FADH2 to electron acceptor molecules?
a. protons b. electrons c. ATP molecules d. ADP molecules e. water molecules