In the pairing of two nucleotides within the double helix,
a. hydrogen bonds are used.
b. adenine and thymine bind together.
c. cytosine binds with guanine.
d. there are three bonds between G and C.
e. all of these
E
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In vertebrates, the family of myogenic regulatory factors (MRFs) plays a major role in muscle development. This family consists of four related genes which have distinct but overlapping functions. This gene family is represented by only a single gene in Drosophila, called nautilus. You want to know whether nautilus plays a role like all of the MRFs put together, or more like one in particular. What is a quick and easy way to begin to address this question?
A. Compare the DNA and protein sequences of all the genes to determine if nautilus is more similar to one MRF than another. B. Use a DNA microarray to compare gene activation patterns between nautilus and the MRFs. C. Compare the proteome of a cell expressing nautilus to the those of cells expressing each of the MRFs in turn. D. Generate four transgenic Drosophila strains that express the MRFs in a mutant nautilus background. 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 already know about sequence analysis? Consider Possibilities · Consider the different answer options. Which can you rule out? 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 atmosphere and seas of the early Earth lacked oxygen. What kind of organisms could NOT have lived under those conditions?
A. obligate aerobes B. obligate anaerobes C. facultative anaerobes D. chemoautotrophs E. cyanobacteria
Mendel knew very little about genetics and nothing about genes or chromosomes. However, his law of independent assortment explains a fundamental phenomenon of genetics. What is that phenomenon?
a. formation of the cleavage furrow and separation of the two progeny in telophase b. crossing over during gametogenesis c. random sorting of the homologous chromosomes during metaphase I d. fertilization and formation of the zygote during sexual reproduction
Which pesticide can trigger rashes, hives, headaches and asthma?
a. atrazine b. growth hormone c. anthocyanin d. DDT
e. sterols