At the end of meiosis II, what is produced?
What will be an ideal response?
four haploid gametes
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Some plasmids can replicate in several distinct species of bacteria. Frequently these plasmids have transposons carrying several different antibiotic resistance genes. In a hospital that has an outbreak of several species of bacteria each carrying resistance to three drugs (streptomycin, gentamicin, and penicillin), what is the best way to determine whether or not this resistance is due to a single shared plasmid with all three resistance genes?
A) Demonstrate that all the resistant bacteria have a plasmid. B) Isolate plasmids from all resistant bacterial species and demonstrate that drug-sensitive cells from these same species become resistant to all three drugs when this plasmid is transformed. Confirm that the same plasmids are present in all species by sequencing the plasmid DNA. C) Sequence the genomes of the resistant species and demonstrate mutations in the same homologous genes. D) Isolate plasmids from one resistant species and transform a drug-sensitive strain of the other bacterial species to see if resistance occurs in the transformants.
In a survivorship curve, a type II species, like a song bird, is a species that has
A. the highest probability of dying as it reaches its maximum life span. B. an extremely short life span. C. a strong possibility of becoming extinct in a relatively short period of time. D. an equal probability of dying at any age. E. the highest probability of dying at a very young age.
The Great Salt Lake would be an excellent location to find methanogens.
a. true b. false
What conditions may trigger reactivation of latent herpesvirus infections?
A. co-infection with hepatitis D virus B. major hormonal changes C. immune suppression D. co-infection with hepatitis D virus along with hormonal changes E. Immune suppression or hormonal changes can both trigger reactivation.