The infectious doses for various bacterial infections are listed in the table below. Which of these bacteria would likely have the greatest virulence? Bacterium Infectious Dose (ID) Mycobacterium tuberculosis 10 Neisseria gonorrhoeae 1,000 Vibrio cholerae 1,000,000,000 Salmonella enterica 10,000
A. Vibrio cholerae
B. Salmonella enterica
C. Mycobacterium tuberculosis
D. Neisseria gonorrhoeae
Answer: C. Mycobacterium tuberculosis
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The simplest viruses consist of
A. RNA only. B. Protein only. C. RNA or DNA in a protein coat. D. RNA or DNA in a protein coat covered with lipid envelope. E. RNA, DNA and enzymes in a protein coat with a lipid envelope.
What is a telomere?
A) the mechanism that holds two sister chromatids together B) DNA replication during telophase C) the site of origin of DNA replication D) the ends of linear chromosomes
Reproduction by mitosis only is asexual.
Answer the following statement true (T) or false (F)
In vertebrates, the family of myogenic regulatory factors (MRFs) plays a major role in muscle development. This family consists of four related genes that 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. Use a DNA microarray to compare gene activation patterns between nautilus and the MRFs. B. Compare the proteome of a cell expressing nautilus to the those of cells expressing each of the MRFs in turn. C. Generate four transgenic Drosophila strains that express the MRFs in a mutant nautilus background. D. Compare the DNA and protein sequences of all the genes to determine if nautilus is more similar to one MRF than another.