The dried residues of fine droplets from mucus or saliva that harbor and transmit pathogen are ________.
A. droplet nuclei
B. mechanical vectors
C. biological vectors
D. aerosols
E. fomites
Answer: A
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Which of these biomes has a plant composition that is most similar to the temperate coniferous forest?
A. alpine B. taiga C. deciduous forest D. rain forest E. chaparral
The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Proterozoic Era. C. Carboniferous Period. D. Triassic Period. E. Devonian Period
Fluzone is a brand name for a very commonly given influenza vaccine. The vaccine is prepared by first harvesting flu viruses in chicken embryos and then breaking apart virus particles into protein subunits, thereby inactivating the virus. Your friend refuses to get the vaccine. Which of these statements is the only valid reason for her not to get the flu vaccine?
A. She could die from the vaccine. B. She could pass the virus onto her baby, causing the child to become autistic. C. She could catch the flu from the inactivated vaccine. D. She is allergic to eggs.
A mutation within a gene that will insert a premature stop codon in mRNA would ________
A) result in a longer polypeptide chain B) result in a shortened polypeptide chain C) change the location at which transcription of the next gene begins D) have the same effect as deleting a single nucleotide in the gene