What prevents mules from having offspring?
A) They don't develop sex organs.
B) They are all males.
C) They can't produce eggs and sperm.
D) Each mule produced is a different species from other mules.
C
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After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. What factor should be measured to determine the difference in effectiveness between the two sites?
A. Temperature B. Oxygen levels C. pH D. Salinity E. Nutrient levels F. All of these factors may play a role. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about bioremediation? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Many clinical microbiology laboratories and public health laboratories use techniques such as microbial staining, microbial growth, enzymatic testing, fermentation testing, and microscopic analysis to identify pathogens in samples. Which categories of classical characteristics for taxonomy are represented here? (Check all that apply.)
A. Morphological characteristics B. Molecular characteristics C. Physiological and metabolic characteristics D. Biochemical characteristics
A gene that determines the heaviness of a man's beard is
A) X-linked. B) sex-limited. C) sex-influenced. D) Y-linked.
Drosophila melanogaster, the fruit fly, has a 2n chromosome number of 8. Assume that you are microscopically examining the mitotic and meiotic cells of this organism
You note that in the female, two chromosomal pairs are metacentric and two pairs are acrocentric. (a) Draw the chromosomal configurations as you would expect to see them at the stages listed: mitotic metaphase first polar body (metaphase) primary oocyte (metaphase) ootid (G1) secondary oocyte (metaphase) (b) Given that the previously mentioned cells are from individuals heterozygous for two independently segregating, autosomal loci, plum eyes and curled wings, place appropriate symbols (of your designation) on chromosomes in the drawings you made for part (a). Assume no crossing over, and there may be more than one correct answer in some cases. (c) Assuming that a somatic G2 nucleus from the individuals mentioned above contains about 8.0 picograms of DNA, how much nuclear DNA would you expect in each of the cells mentioned in part (a)?