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Embryonic pattern specification during development in some cases requires maternally contributed ‘determinants', and in others is regulated by signaling between cells. For each of the following developmental events, indicate whether it is primarily maternally contributed determinants or instead local interactions between cells that is most important. In addition, name one important gene involved in each process.
(a) Germ cell specification in Drosophila
(b) Neural Crest Cell specification in vertebrates
(c) Anterior/Posterior border specification in Drosophila wing imaginal disk
Purine biosynthesis is allowed to take place in the presence of [N15]aspartate, and the newly synthesized GTP and ATP are isolated. What positions are labeled in the two nucleotides.
How does an active infection occur in the urinary tract? Which factors in the urinary tract predispose humans toward urinary tract infections?
Calculate the surface areas and volumes of both of these cells then calculate the sa/v for each of them. The SA, V and Sa/V dived out of each of theses cells. which one of these would be most efficeint at feeding itself?
Is the action of lactase condsidered endergonic or exergonic? Why would chromosomes shorten with each replication cycle in the absence of telomerase? Detail account on transmission of nerve impulse
Suppose that P is always completely dominant to any number of p's, and that the locus is close to the centromere. What is an expected ratio of purple:white in the progeny of the next crosses.
A researcher creates a drug that blocks Ca channels. what would be prevented by this drug in muscle contracion.
Describe the processes involved in the transformation of solid materials in rock into soluble nutrients in soil. What biological factors can influence the rate of this transformation?
How is the gene for β-galactosidase used in the construction of a plasmid?
Draw the structure of a plant cell, label the parts and include the major biological molecules found in such cell referring to specific parts. Include the functions of each structure.
What is the distribution not the typical 1:1:1:1 that is observed in a dihybrid test cross.
What are the immediate challenges that personalized medicine confronting in our present time? What are your suggestions to solve them? What are the major four groups of causes of cancer?
Biology Quiz: Using information at the CDC Influenza website, What is the most prevalent strain of influenza that is circulating in the 2012-13 flu season (Select one)?
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