Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____
a. vessel elements; companion cells
b. sieve elements; companion cells
c. sieve elements; tracheids
d. vessel elements; sieve elements
e. vessel elements; tracheids
ANSWER: e
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Natural killer cells like Tc cells use ________ and granzymes to kill their targets without prior exposure or contact with the foreign cells
A) coagulants B) M protein C) perforin D) interferon gamma
A middle-aged women presented to the emergency room complaining of cramping and gastrointestinal discomfort. She had recently attended a family reunion the past weekend. The event was a picnic where potato salad, hamburgers, deviled eggs, hot dogs and chips were served. A feces culture was requested resulting in no growth. What would be the next recommended follow-up testing?
a. Serologic testing for IgM and IgG b. No follow-up testing required c. Collect an additional specimen and at-tempt to cultivate on specialized media d. Treat the patient with ampicillin
Which organism provides a good example of sexual dimorphism?
a. Sage grouse b. Hangingfly c. Sparrows d. Fruit flies e. Fiddler crabs
All of the following are examples of symbiotic relationships except
A. algae and fungi living together as a lichen. B. the protozoa that live in the intestine of termites and digest cellulose that termites cannot digest. C. the mosquito that visits a mammal for a blood meal. D. the malaria parasite that lives in the liver of humans.