When epinephrine binds to its G-protein linked receptor ____ is activated producing ___.
A. phospholipase C, diacylglyceride
B. kinase, calcium
C. kinase, transcription factor
D. enzyme linked receptors, protein kinase
E. adenylyl cyclase, cAMP
E. adenylyl cyclase, cAMP
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A couple has a baby that is monosomic for the X chromosome. This most likely occurred during meiosis because:
A. there was nondisjunction of the sister chromatids. B. there was an inversion in the X chromosome and crossover occurred. C. there was a duplication in the X chromosome and crossover occurred. D. there was translocation of another chromosome onto the X chromosome. E. either there was an inversion in the X chromosome or there was a duplication in the X chromosome and crossover occurred.
Vincristine is a cancer chemotherapy drug. It binds to tubulin dimers, inhibiting assembly of microtubules. Where do you predict that vincristine stops the cell cycle?
A. S phase B. Prophase C. Metaphase D. Telophase
Symptoms of heat exhaustion include all of the following except ________
a. impaired judgment b. sweating c. release of toxins into the blood d. dizziness
The pyramid of energy illustrates
a. the first law of thermodynamics. b. the diminishing of usable energy as it is transferred through an ecosystem. c. that energy can be recycled. d. the biological magnification of materials in an ecosystem. e. the diminishing number of organisms at each trophic level.