The potential seventh mass extinction refers to ____
a. the loss of 50% of species on Earth, including dinosaurs, at the end of the Cretaceous
b. the most extensive loss of species that occurred during the Permian
c. what will happen to the human species if a nuclear war occurs
d. the rapid loss of biodiversity due to human degradation of the environment
e. events that occurred just before insects diversified on land
ANSWER: d
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Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. helix. B. ribbon. C. hollow cylinder. D. pleated sheet. E. icosahedron.
At which stage is the foreign gene introduced into the developing embryo?
a. blastocyst, via a transgenic cell b. egg, via direct microinjection of the new DNA c. sperm, via direct microinjection of the new DNA d. in cell culture, prior to fertilization e. it all depends on the method the particular researcher prefers.
For the molecule that is impermeable, is diffusive equilibrium possible?
a. Yes b. No
In the diagram below, what type of control, positive or negative, is operating?
What will be an ideal response?