Which of the following occurs during metaphase of mitosis?
a. Centrioles migrate to opposite poles of the cell.
b. Chromatin condenses into chromosomes.
c. The nuclear envelope disappears.
d. Chromosomes decondense into chromatin.
Answer: a. Centrioles migrate to opposite poles of the cell.
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Dr. John Doe, a research microbiologist for a university medical center, has been accused of sending Bacillus anthracis, the causative agent of anthrax, through the mail to the President. You, as a public health official with the CDC, have to determine if it is the same strain as the two strains of B. anthracis found cultured in his lab. Which method of identification would you use to compare these three bacterial samples?
A. Pulse-field gel electrophoresis B. Biochemical test identification C. Serological testing using agglutination D. Gram staining
Bioaugmentation
A. adds specific microorganisms to the polluted site. B. only enhances the growth, onsite, of the resident population of microbes. C. usually utilizes genetically engineered bacteria. D. is typically done offsite. E. only enhances the growth, onsite, of the resident population of microbes AND usually utilizes genetically engineered bacteria.
In humans, XO individuals are females with Turner syndrome and XXY individuals are males with Klinefelter syndrome. Which of the following events cannot give rise to a Klinefelter male?
A) nondisjunction at meiosis I in the mother B) nondisjunction at meiosis II in the mother C) nondisjunction at meiosis I in the father D) nondisjunction at meiosis II in the father E) All of the choices could give rise to a Klinefelter male.
Paracrine signaling is different from other types of signaling in that the signaling molecule:a
is produced by endocrine glands. b. binds to a receptor. c. is secreted by neurons. d. is transported in the blood. e. acts on nearby cells