What nucleic acid is subject to alternative splicing?
A. DNA
B. rRNA
C. pre-mRNA
D. mRNA
E. tRNA
C. pre-mRNA
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A 28-year-old woman was gardening when a rose thorn pricked her finger, which later became infected. A sample is taken of the exudate and sent to the microbiology laboratory. Small, round, cigar-shaped structures are microscopically observed. She is most likely infected with which type of fungi?
a. Malassezia furfur b. H. capsulatum c. S. schenckii d. Fonsecaea pedrosoi
Bacterial cells typically have ____ while eukaryotic cells have ____
a. a single circular chromosome; many linear chromosomes b. several circular chromosomes; many linear chromosomes c. one linear chromosome; many circular chromosomes d. two circular chromosomes; numerous circular chromosomes depending on the species e. numerous circular chromosomes depending on the species; many linear chromosomes
Nephrotic syndrome is characterized by ____
a. large amounts of protein in the urine b. the inability to thermoregulate c. the inability to urinate d. large amounts of urea in the urine e. increased urine production
Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few
inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006 . What element does an atom of 210Po change into after it emits an alpha particle? What will be an ideal response?