How do we know that MADS-box genes are older than flowers?
What will be an ideal response?
ANS:
MADS-box genes occur in nonflowering species as well as flowering species. Because the divergence of these two groups is before the evolution of flowers, the genes must be older than flowers.
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An example of a ?-hemolytic gram-positive organism is:
a. Staphylococcus aureus. b. S. pneumoniae. c. Escherichia coli. d. Enterococcus.
What is meant by the term "paralytic shellfish poisoning"? What are the symptoms, and what organisms are responsible for this disease?
What will be an ideal response?
How many mass extinctions have occurred over all of geologic history?
a. one b. two c. three d. four e. five
A doctor is treating a patient who has some form of anemia. First, the doctor tries to give the patient extra vitamins that contain iron, to no effect. There is no evidence of lead poisoning. The doctor tries an injection of vitamin B12, and the anemia
is under control. What type of anemia did the patient have? A) hemorrhagic anemia B) iron-deficiency anemia C) pernicious anemia D) sickle-cell anemia