Which hormones enter cells and alter mRNA production?
a. steroid and peptide hormones
b. steroid and phospholipid hormones
c. thyroid and peptide hormones
d. peptide and phospholipid hormones
e. steroid and thyroid hormones
ANSWER: e
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Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid. The frogs are identical in appearance, but their mating calls, which females use to find
mates, differ. Which difference most likely evolved first? A) polyploidy B) difference in mating calls C) Polyploidy and different mating calls must have evolved at the same time.
A defect in which of the following systems leads to granulomatous disease?
A. lymphatic system B. circulatory system C. oxidase system D. Golgi system
Radiation exposure can destroy lymphocytes and lead to what?
a. meningitis b. cancer c.an immunodeficiency d. a hypersensitivity
Amphibians are distinguished from earlier vertebrates by ____
a. the development of eggs capable of hatching on land b. metamorphosis c. the development of limbs capable of moving on land d. the presence of scales to prevent desiccation e. absence of gills in any stage of development