Oxygen has six electrons in its second outer shell, and hydrogen has one. With how many hydrogen atoms will oxygen form covalent bonds?
A) three B) eight C) six D) two E) one
Answer: D
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Mitotic recombination occurs between homologous chromosomes. In which of the following would you not expect to encounter mitotic recombination?
A) e. coli B) tobacco plants C) homo sapiens D) drosophila melanogaster
Climate is the
a. average weather conditions an area receives over a short period of time. b. average weather conditions an area receives over a long period of time. c. amount of sunlight an area receives over the course of a year. d. amount of rainfall an area receives over the course of a year. e. amount of erosion that occurs in an area over the course of a year
Colchicine is an alkaloid derived from plants. What is its effect on chromosome behavior?
A) By blocking DNA replication, chromosomes fail to migrate to the poles at anaphase; thus, homologous chromosomes end up in the same nucleus. B) By blocking DNA replication, chromosomes do not undergo meiosis I and instead all gametes suffer from aneuploidy. C) By interfering with spindle formation, replicated chromosomes fail to migrate to the poles at anaphase; thus, sister chromatids end up in the same nucleus. D) By interfering with spindle formation, replicated chromosomes fail to migrate to the poles at anaphase; thus, homologous chromosomes end up in the same nucleus. E) By blocking DNA replication, chromosomes do not undergo meiosis II and instead half the gametes are empty.
The term used to describe bacteria that are shaped like curved rods is ________.
A. coccus B. bacillus C. vibrio D. coccobacillus