Where on this phylogenetic tree of primate evolution do you find evolution of the hominids?
A. No. 1
B. No. 2
C. No. 3
D. No. 4
E. No. 5
Answer: C
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A rightward shift in the oxygen dissociation curve means that:
A. the affinity of hemoglobin for O2 has decreased. B. the hemoglobin protein has denatured. C. the pH of the blood has increased. D. the CO2 levels in the blood have decreased. E. less O2 is released by hemoglobin to the body cells.
The bacterium Brucella abortus imports and uses the unusual sugar erythritol. The concentration of erythritol within the B. abortus cell is 10 mM, but the external erythritol concentration is much lower at 0.20 mM
What is the energy requirement (?G inward in kcal/mol) for the inward transport of erythritol at 37°C under these conditions? What will be an ideal response?
Hershey and Chase tagged the DNA of viruses with radioactive phosphorus, and their protein coats with radioactive sulfur. When the viruses were allowed to infect bacteria, what did the viruses transfer to the bacteria?
A. radioactive phosphorus B. neither radioactive phosphorus nor sulfur C. radioactive phosphorus and sulfur D. radioactive sulfur
Heterotrophs that obtain energy and carbon by feeding on both animal and plant materials are called ____.
A. detritivores B. herbivores C. carnivores D. omnivores E. decomposers