Calcium is necessary to initiate muscle contraction. Which of the following molecules binds calcium?
A. myosin
B. actin
C. troponin
D. tropomyosin
C
Biology & Microbiology
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A higher frequency of action potentials is interpreted by the brain as a(n):
a. somatic sensory stimulus b. visceral sensory stimulus c. strong sensory stimulus d. localized sensory stimulus e. weak sensory stimulus
Biology & Microbiology
The first cells were ____
anaerobic a. autotrophic b. parasitic c. anaerobic d. aerobic e. necrotic
Biology & Microbiology
Which of the following is NOT a cause of mutation?
A. Errors in DNA replication B. Errors during meiosis C. Exposure to radiation D. Exposure to tobacco E. All of the choices are causes of mutations.
Biology & Microbiology
Which of the following is the source of electrons for the light reactions?
A) C6H12O6 B) CO2 C) NADPH D) H2O
Biology & Microbiology