Colchicine is a drug that:a
arrests cells in mitotic telophase.
b. stimulates meiosis.
c. prevents DNA replication.
d. arrests cells in mitotic metaphase.
e. prevents cells from entering prophase
D
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What functional group is not present in the following structure for thyroxine (thyroid hormone)?
a. carboxylic acid b. organic halide c. amine d. all of the above
The process of carbon dioxide fixation refers to
A. reaction of carbon dioxide with water to form carbonic acid. B. release of carbon dioxide during catabolic reactions. C. reduction of carbon dioxide and incorporation into organic molecules that are assimilated. D. release of carbon dioxide during anabolic reactions.
Meiosis and cytokinesis result in the formation of ________.
A. four haploid cells B. two diploid cells C. four diploid cells D. two haploid cells
Why does an embryo with a balanced translocation have the same chance for normal development that an embryo with a normal karyotype has?
A. The translocation stimulates DNA repair mechanisms to correct the problem before commitment occurs. B. The embryo's somatic cells are unaffected, expressing a normal karyotype; only germline cells express the translocation. C. Although the location of the genetic material is abnormal with a balanced translocation, there are no missing or extra alleles. D. When a zygote with a balanced translocation reaches the embryo stage without a spontaneous abortion, the risk for abnormal development decreases.