The diploid set of chromosomes in Drosophila embryos replicates six times faster than the single E. coli chromosome, even though there is about 100 times more DNA in Drosophila than in E
coli and the rate of movement of the replication fork in Drosophila is much slower. How is this so?
Eukaryotic chromosomes duplicate rapidly because DNA replication initiates at many origins of replication throughout the genome. In E. coli, there is only one replicon, while in eukaryotes there are multiple, smaller replicons.
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The antimicrobial action of artemisinin is not well understood but this chemical appears to
A. raise the internal pH, clump the plasmodial pigment, and intercalate into plasmodial DNA. B. form reactive oxygen intermediates inside Plasmodium-infected red blood cells. C. inhibit heme polymerase, an enzyme that converts toxic heme into nontoxic hemazoin. D. swell the Plasmodium falciparum food vacuoles.
Select the correct sequence for the pathway of blood through the heart.
A. Body ? Left atrium ? Left ventricle ? Lungs ? Right atrium ? Right ventricle ? Body B. Body ? Right ventricle ? Right atrium ? Lungs ? Left ventricle ? Left atrium ? Body C. Body ? Left ventricle ? Left atrium ? Lungs ? Right ventricle ? Right atrium ? Body D. Body ? Right atrium ? Right ventricle ? Lungs ? Left atrium ? Left ventricle ? Body
Four of the five answers listed below are related conditions in which abnormal numbers of
chromosomes are present. Select the exception. a. monosomy b. Down syndrome c. nondisjunction d. complete chromosome set e. trisomy
Which of the following immunoglobulins is produced by plasma cells in response to an allergen?
A) IgA B) IgD C) IgE D) IgG E) IgM