The causative agent of streptococcal pharyngitis, also known as "strep throat," is
A) Streptococcus pyogenes.
B) Streptococcus pneumoniae.
C) Streptococcus mutans.
D) Streptococcus lactis.
Answer: A
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What is the function of tropomyosin in muscle cells?
A. Tropomyosin binds to actin molecules and brings about shortening of the muscles. B. Tropomyosin covers the myosin binding sites on the actin molecules, preventing contraction from occurring. C. Tropomyosin is the contractile unit of the muscle cell. D. Tropomyosin stores calcium.
When cells differentiate, they ____
a. lose DNA b. remain totipotent c. express a specific subset of genes d. stop growing e. gain DNA
Fossils of plants found in deeper geologic layers do not show vascular tissues, while fossils in shallower geologic layers include some specimens with and some without vascular tissues. Thus, vascular tissue in plants is considered a ____ character.
a. ancestral b. mosaic c. primitive d. derived e. physiologically essential
All science begins with ________, which is the first step in the process known as the scientific method
Fill in the blank(s) with correct word