Which of the following is not a regulatory mechanism used to control the lactose operon in Escherichia coli?
A. Induction
B. Attenuation
C. Catabolite repression
D. All of the choices are correct.
Answer: B
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All evidence suggests that the Neanderthals did not interbreed with our ancestors
A. true B. false
Which of the following is NOT an outcome of neurulation?
A. establishment of cells that will form future pigment cells and certain facial bones B. establishment of the central nervous system C. establishment of the neural crest D. establishment of the archenteron E. establishment of somites
Dispersion is
A. the ability of an individual to move. B. the rate of movement of a population. C. the spatial distribution of abiotic factors. D. the spatial distribution of individuals. E. the timing of reproduction.
In fetal circulation, most blood is shunted away from the lungs. Why is this the case?
A) The lungs don't need any blood. B) The fetus receives oxygen at the placenta, and the lungs are not yet fully functional. C) The lungs do not form until right before birth. D) The lungs have their own circulation.