Performing a complementation test through cotransduction using mutant phage genomes created by X-ray mutagenesis (mutants a-e), as well as ones created by chemical mutagenesis using EMS (mutants 1-5), you get the following results: 1 2 3 4 5
a — + + — — b — + — — — c + + — — + d + — + + — e — — + + — Explain this data.
X-rays create DNA breaks that lead to deletions, and chemical mutagens such as EMS result in point mutations. Thus, mutants a-e are deletion mutants and 1-5 are point mutants. Analysis of the data can provide us with a comparative map of the mutants as follows (this map can be flipped horizontally).
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The body of a fungus has several characteristics. One of these is their hyphae, long chains of cells. Which of the following statements best describes the nature of septa and cross walls?
A. Septa of the cross walls are formed on the outside of fungal cells and give the fungal body more rigidity. B. Septa form cross walls between the long chains of cells that make up hyphae. C. The cross wall within the nuclear membrane of every fungal body forms septa. D. Spores of fungi that are formed within reproductive structures have cross walls separated by septa. E. Cross walls are responsible for the formation of spindle plaques within the hyphae after the septa are produced.
Campylobacter jejuni is commonly found in the intestinal tract of ________.
A. chickens B. cattle C. turkeys D. All of the choices are correct.
A person with a defect in blood flow to the kidney would have a problem with the artery.
A. brachial B. radial C. hepatic D. renal E. carotid
Opportunistic species typically ________
A) are very long-living B) have a large number of offspring C) reach sexual maturity slowly D) exhibit a Type I survivorship curve