During each PCR cycle, what happens to the number of copies of a DNA segment?
A.) It stays the same.
B.) It doubles.
C.) It quadruples.
D.) It increases to 1 billion.
Ans: B.) It doubles.
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The risk of ____________________, which occurs when the embryo begins to grow outside the uterus, increases with
the use of IVF. Fill in the blank(s) with the appropriate word(s).
Which statement best reflects the main difference between the genomes of bacteria, archaea, and eukaryotes?
A. Eukaryotes have larger genomes than bacteria and archaea since they are larger cells. B. Pathogens have larger genomes than non-pathogenic microbes since genome size is generally dependent on the presence of pathogenicity islands. C. Eukaryotes have a high gene density compared to bacteria and archaea since their genes contain introns. D. Intracellular parasites have the smallest genomes since they have evolved to lack genes that code for the synthesis of essential metabolites.
Plaque assays are used for
A) evaluating the cancer-causing ability of a virus. B) determining the density of phage in a culture. C) the study of prions. D) cultivating viruses that cannot be grown any other way. E) counting the number of latent phages in a cell.
Put the following steps in the procedure for producing a karyotype in the correct order.I. Cells are visualized under the microscope.II. Cells are stimulated to divide.III. Homologues are organized into sets by matching size and banding patterns.IV. The cells are exposed to a hypotonic solution.V. Cells are stained and placed on a microscope slide.
A. II, IV, I, V, III B. IV, II, V, I, III C. IV, V, II, I, III D. I, II, IV, V, III E. II, IV, V, I, III