Gene therapy is a technique in which DNA from one species is inserted into a different species
Indicate whether the statement is true or false
FALSE
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Contents of the digestive system are moved along by rhythmic contractions and relaxations of smooth muscle. This process is called _________
Fill in the blank(s) with the appropriate word(s)
Most triploid zygotes arise from
A. fertilization of a diploid egg by a normal haploid sperm. B. fertilization of a normal haploid egg by a diploid sperm. C. fertilization of a normal haploid egg by two sperm. D. nondisjunction during the zygote's first mitotic division. E. fusion of the zygote with an unfertilized egg.
Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to
A) the active site of an allosteric enzyme that binds to a specific substrate. B) tRNA specifying which amino acids are in a polypeptide. C) a metabolic pathway operating within a specific organelle. D) an enzyme having an optimum pH and temperature for activity. E) an antibody in the immune system
"Lucy," who belongs to the group ________, was a bipedal hominin with a brain smaller than that of humans
A) Australopithecus B) Homo erectus C) Ardipithecus D) Homo habilis