The thin filaments of sarcomeres are composed of _____.

A. myofibrils
B. actin
C. motor neurons
D. myosin
E. Z lines


Ans: B. actin

Biology & Microbiology

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Parts of an mRNA molecule that are removed before protein synthesis are called

A) exons. B) exomes. C) promoters. D) introns.

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Which of the following is an example of local control over breathing?

a. automated lung ventilation and lung perfusion adjustments maximizing O2 and CO2 exchange b. the aortic bodies signaling an increase in breathing rate when blood pH is acidic c. the interneuron groups of the pons refining the contractions involved with inhalation and exhalation d. the carotid bodies signaling an increase in breathing rate when O2 levels are low e. the ventral group of interneurons signaling an increase in breathing rate and depth during exercise

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Which country is expected to be invited to join NAFTA?

a. Brazil b. Venezuela c. Honduras d. Chile

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A directional adjustment of growth in response to environmental stimuli is called ____.

A. circadian rhythm B. vernalization C. photoperiodism D. statolith E. tropism

Biology & Microbiology