Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours?
A. It brings minerals up the plant.
B. It gives plants a needed rest.
C. It prevents sugar transport to the guard cells.
D. It helps to conserve water.
E. It prevents loss of CO2.
Answer: D
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If she moves the promoter for the lac operon to the region between the beta galactosidase (lacZ) gene and the permease (lacY) gene, which of the following would be likely?
A) The three structural genes will be expressed normally. B) RNA polymerase will no longer transcribe permease. C) The operon will still transcribe the lacZ and lacY genes, but the mRNA will not be translated. D) Beta galactosidase will not be produced. E) The cell will continue to metabolize but more slowly.
Plants contain meristems whose major function is to _____
A) attract pollinators B) absorb ions C) photosynthesize D) produce more cells E) produce flowers
Which is true about guncotton?
a. It is a highly explosive derivative of cholesterol. b. It is used to make gunpowder. c. It is less stable than gunpowder.
d. It is more stable than gunpowder. e. It has a higher activation energy for a reaction with oxygen than gunpowder.
An organism has one Z chromosome and one W chromosome. That organism is
A. a female bird. B. a male insect. C. a female insect. D. a male or female human. E. a male bird.