Which of the following problems exist when performing human gene therapy?
A. The virus vector may cause a lethal immune reaction itself in rare cases.
B. The virus vector may insert its DNA into the middle of a gene, which could lead to cancer.
C. The vector used to carry the gene may elicit a strong immune response, leading to rejection of the added gene.
D. All of the choices are correct.
Answer: D
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What is a valid, testable prediction based on this hypothesis?
A. Male crocodiles will prefer temperatures of 32 – 33?C. B. Incubation of any crocodile egg at 32?C, will result in a male crocodile. C. Male eggs will hatch at 32?C, while female eggs will not hatch at 32?C. D. Male eggs will be more fragile than female eggs. E. Crocodiles arrange the gender of offspring by manipulating incubation temperatures.
From the surface to the interior of a tooth, the tissues in order are
A. enamel, dentin, and pulp. B. dentin, enamel, and pulp. C. dentin, pulp, and enamel. D. pulp, dentin, and enamel. E. enamel, pulp, and dentin.
Lichens of the supralittoral fringe are compound associations between:
a. algae and bacteria. b. fungi and bacteria. c. bacteria and cyanobacteria. d. fungi and algae. e. algae and cyanobacteria
Choose the letter of the best match from the following:A. Abscisic acidB. TrichomesC. AquaporinD. EndodermisE. StomaRegulates movement of mineral ions into root xylem.
Fill in the blank(s) with the appropriate word(s).