One type of mutation involves the replacement of a purine with a purine, whereas another causes the replacement of a pyrimidine with a purine or the reverse. What general terms are associated with these two mutational phenomena?
What will be an ideal response?
transition and transversion, respectively
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The snottites described in the case study at the beginning of this section are colonies of bacteria, extremophiles that have some unique requirements for life processes
For example, they use sulfur from the hydrogen sulfide in the environment to capture energy. Although most life forms you are familiar with, including humans, don't use sulfur for this purpose, we do use another element to do the same thing. Which element do humans use for this energy conversion? Carefully examine the periodic table. A. carbon B. nitrogen C. hydrogen D. oxygen
Animals that have no circulatory systems tend to be
a. small. b. cylindrical. c. flattened. d. composed of filaments made of cells. e. any of these.
Provide a formal equation for h2 (narrow-sense heritability)
What will be an ideal response?
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would happen in environments that lack antibiotics?
A) These genes would be maintained in case the antibiotics appear. B) These bacteria would be outcompeted and replaced by bacteria that have lost these genes. C) These bacteria would try to make the cost worthwhile by locating and migrating to microenvironments where traces of antibiotics are present. D) The number of genes conveying antibiotic resistance would increase in these bacteria.