Gurdon's nuclear transplantation experiments with clawed toads supported the hypothesis that:
A. differentiation is the result of genes being
successively deleted from the genome.
B. differentiation is the result of genes being
successively turned off.
C. differentiation causes cells to become
pluripotent.
D. only nuclei from the blastocyst retain
sufficient potency to produce an adult
organism.
E. All of these choices are correct.
B
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Based on the cladogram, birds are most closely related to
A. snakes.
B. dinosaurs.
C. crocodiles.
D. mammals.
E. amphibians.
By 1700 CE, the island's landscape had changed dramatically. Which statement describes this change?
What will be an ideal response?
Which of the following pairs of molecules could be joined together by a peptide bond in a dehydration reaction?
A) 2 and 3 B) 7 and 8 C) 8 and 9 D) 12 and 13
Which of the following indicates a poorly designed study?
A) a control group B) variables were controlled C) bias D) follow-up studies