DNA encoding a normal gene is inserted into cells from a patient with a defective form of the gene. Recombinant cells are identified and isolated, and returned to the patient's body. This is an example of
A) gene therapy.
B) genomics.
C) genetic mapping.
D) genotyping.
E) biotechnology.
A
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Target tissues for steroid hormones and thyroid hormones do not have membrane receptors for these
hormones because they
a. stimulate the cell by changes in electrical activity. b. are water soluble. c. enter the cell by ion channels. d. are small enough to diffuse directly into the cell. e. are soluble in the lipid bilayer.
Answer the following statements true (T) or false (F)
1.The earliest cells probably originated about 3.5 billion years ago. 2.The endosymbiont theory states that eukaryotic cells work together to form a multicellular organism. 3.The endoplasmic reticulum, Golgi apparatus, and other membranous organelles of cells might have formed by numerous infoldings of the cell's outer membrane. 4.The three periods of the Mesozoic era are the Triassic, Jurassic, and Cretaceous. 5.The two major extinctions of living species occurred during the Mesozoic era.
Which adaptations originated in some fishes and enabled vertebrates to thrive on land?
A. limbs and lungs B. lungs C. fins D. limbs E. lungs and fins
Among children with parents who are both carriers of Tay-Sachs, an autosomal recessive disorder, chances are that
a. 75 percent will be carriers. b. 50 percent will die in a few years. c. 75 percent will not carry the recessive Tay-Sachs's allele. d. 50 percent will be carriers.