Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain becomes nonlethal. Type R Streptococcous pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The S strain would be transformed into the nonvirulent R strain and kill the host.
B. The R strain would be transformed into the virulent S strain and kill the host.
C. The S strain would be transformed into the nonvirulent R strain and not affect the host.
D. The R strain would be transformed into the virulent S strain and not affect the host.
E. Neither the S nor the R strain would change.
B. The R strain would be transformed into the virulent S strain and kill the host.
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All else being equal, selection should more strongly favor reinforcement of reproductive isolation among related species:
A. in allopatric populations over sympatric populations. B. in sympatric populations over allopatric populations. C. in peripatric populations over sympatric populations. D. in peripatric populations over allopatric populations. E. in allopatric populations over peripatric populations.
Which of the following statements is true regarding anammox?
A. It can be carried out by both eukaryotes and archaeons. B. It generates less energy compared to respiration. C. It is performed in oxygen-rich environments. D. It is identical to nitrogen fixation. E. All of these answer options are correct.
In Drosophila, the genes y (yellow body) and car (carnation eyes) are located at opposite ends of the X chromosome. In doubly heterozygous females (y+car+ / ycar), a single chiasma is observed somewhere along the X chromosome in 90% of the examined oocytes. No X chromosomes with multiple chiasmata are observed. What percentage of the male progeny from such a female would be recombinant for y and car?
A) 5% B) 10% C) 45% D) 55% E) 90%
DNA sequencing
1.uses dideoxynucleoside triphosphates. 2.uses fluorescent dyes. 3.determines the base sequence of pieces of DNA. 4.is an important tool in genomics. 5.All of the options are correct.