The sarcoplasmic reticulum stores ions that are necessary for skeletal muscle contractions. Which of the following ions does it store?
A) magnesium B) calcium C) iron D) sodium
Answer: B
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Which one of the following is not a component of an amino acid?
A. an alpha carbon B. an amino group C. a carboxyl group D. an R group E. a phosphate group
Which type of microscopy utilizes lasers that scan across a fluorescently-stained specimen and a computer that focuses
the light to give sharp 3D images?
a. confocal laser scanning microscopy b. phase-contrast microscopy c. bright field microscopy d. scanning electron microscopy e. fluorescence microscopy
Fragile X syndrome is one of the most common sources of inherited ____
a. sterility b. mental retardation c. blindness d. cancer e. deafness
The evidence that one species of finch migrated to a Galàpagos island, and evolved into two species now found on the same island, feeding on different food sources, is an example of speciation.
A. postzygotic B. prezygotic C. parapatric D. allopatric E. sympatric