Which event or events occur during anaphase?
a. Identical chromatids move to opposite poles
b. A spindle made of microtubules is present
c. The centrioles are at opposite poles
d. All of the listed responses are correct.
e. The centromeres divide
Answer: d. All of the listed responses are correct.
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A gardener is constantly struggling with the growth of weeds in his perennial flower beds. At
the start of the growing season one year, he sprays an herbicide to reduce the number of weeds. Although the herbicide kills many of the weeds, some develop resistance to the herbicide and continue to grow and spread among his flowering plants. After a few years, the gardener decides to stop all herbicide applications. One of the changes that he notices is that the weeds that have resistance to herbicides grow much more slowly and are easily outcompeted by other weeds when no pesticides are sprayed (i.e., the herbicide-susceptible weeds produce more seeds and quickly overtake some of the areas in the garden where the herbicide-resistant weeds had been growing).
Resistance to herbicides has arisen in the population through the process of __________.a. natural selection b. mutation c. evolution d. fertilization
Four of the five elements listed below are
macronutrients. Select the exception. a. manganese b. potassium c. calcium d. magnesium e. phosphorus
Inhibitors of enzymes can be either reversible or irreversible. In addition, most reversible inhibitors are either competitive or noncompetitive
Based on what you know about enzyme inhibition, classify the following examples as irreversible, competitive, or noncompetitive enzyme inhibition. A) competitive B) noncompetitive C) irreversible 1) Diisopropyl fluorophosphate binds to acetylcholinesterase and permanently inactivates the enzyme. Paralysis results. 2) A drug binds to the active site of an enzyme but disassociates and leaves the enzyme active. 3) A toxin binds to the surface of an enzyme. The enzyme then binds the substrate, but no product is produced. The toxin may disassociate and the enzyme will become active again. 4) Vitamin K is a coenzyme involved in blood clotting. An anticoagulant drug binds at the site of vitamin K bonding, blocking vitamin K binding and preventing clotting. Clotting resumes after the patient stops taking the drug. 5) Aspirin binds to prostaglandin synthetase and permanently stops its ability to produce prostaglandin.
The number and kinds of genes inherited by a population is called the
a. genotype. b. phenotype. c. gene pool. d. genetic drift. e. genetic variation.