Rodents, marsupials, and nonhuman primates are all reservoirs for which Schistosoma species?
a. S. japonicum
b. S. haematobium
c. S. mansoni
d. Schistosoma intercalatum
D
S. intercalatum is primarily found in central and western Africa. Reservoirs include rodents, marsupials, and nonhuman primates.
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How many tetrads are present in a single elephant cell (2n=56) during metaphase I of meiosis?
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about tetrads? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
The presence of an extra X chromosome is more likely to result in a viable human fetus than an extra copy of an autosome because:
A. expression of genes from the X chromosome is restricted to early development of females. B. the X chromosome carries few genes, so dosage is not a problem. C. the X and the Y chromosomes do not recombine along most of their length. D. the X chromosome is the "female" chromosome. E. None of the above F. All of the above
Photorespiration is a wasteful process that could be largely avoided if rubisco would bind only CO2
__________________ Indicate whether the statement is true or false.
You are performing a Gram stain on gram-positive bacteria and you stop after the addition of the counterstain. What is the appearance of the bacteria at this point?
A) purple B) red C) colorless D) brown