In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu
" Although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. What is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? A) The virus was descended from a common ancestor of bird, pig, and human flu viruses.
B) The infected individuals happened to be infected with all three virus types.
C) Related viruses can undergo genetic recombination if the RNA genomes mix and match during viral assembly.
D) The human was likely infected with various bacterial strains that contained all three RNA viruses.
C
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Salmonellosis is most frequently caused by
A) Salmonella enterica serovar Typhi. B) Salmonella enterica serovar Typhimurium. C) Salmonella enterica serovar Enteriditis. D) Salmonella enterica serovars Typhimurium and Enteriditis.
Some restaurants serve seafood platters that contain oysters, mussels, and clams. Such platters therefore consist of ________
A) sponges B) cnidarians C) gastropods D) mollusks
What is the main cause of guttation in plants?
a) plant injury b) condensation of atmospheric water c) transpiration d) pressure flow in phloem e) root pressure
Imagine a diploid sexually reproducing organism, Diploidus sexualis, that contains three pairs of chromosomes. This organism is unusual in that no recombination between homologous chromosomes occurs during meiosis
A. Assuming that the chromosomes are distributed independently during meiosis, how many different types of sperm or egg cells can a single individual of this species produce? B. What is the likelihood that two siblings of this species will be genetically identical? You can assume that the homologous chromosomes of each parent are different from one another and from their counterparts in the other parent.