According to Kluyver and van Niel, which of the following are TRUE of basic biochemical reactions?
A) They are shared by all living things.
B) There are an unlimited number of them.
C) They primarily involve the transfer of electrons and ions.
D) Basic biochemical reactions shared by all living things primarily involve transfer of electrons and hydrogen ions.
E) They primarily involve transfers of chemical groups.
D
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An anthropologist discovers the fossilized heart of an extinct animal
The evidence indicates that the organism's heart was large, was well-formed, and had four chambers, with no connection between the right and left sides. A reasonable conclusion supported by these observations is that the _____. A) animal had evolved from birds B) animal was endothermic and had a high metabolic rate C) animal was most closely related to alligators and crocodiles D) animal was likely an invertebrate animal E) species had little to no need to regulate blood pressure
Which set of steps best accounts for the role of the axon hillock in nerve cell activity?
A. depolarization, summation, threshold, action potential B. threshold, refractory period, depolarization, action potential C. threshold, action potential, refractory period, summation D. summation, refractory period, threshold, action potential
What happens when coleoptiles are illuminated with directional light from the side instead of from directly overhead?
A. More auxin is produced. B. Less auxin is produced. C. Auxin is transported away from the lighted side. D. Auxin is transported toward the lighted side. E. Auxin receptors are activated.
Your friend Joe recently visited the doctor for steroid injections into his knee to reduce swelling due to a previous knee injury. Within a couple of days, he had an infection caused by Pseudomonas, a very pathogenic and drug resistant bacterium. Luckily, Joe went to the doctor immediately and received antibiotics. The doctor tells him that the same problem has occurred to many other people across the United States. Predict the most likely cause of this situation.
A. The needles were re-used and already contaminated before being used on the patients. B. The steroid was contaminated at the production plant, so all batches of that drug made at that plant were contaminated with the bacterium. C. The bacterium is normally on the skin of people, so can easily access the patient's blood during the needle stick. D. The staff giving the steroid injections did not use proper aseptic technique.