Recall that the P. torridus archaeon is a(n) ______________, and so thrives in extremely acidic environments (pH 0-0.7) such as old coal mines
A. hypothermophile
B. hyperthermophile
C. halophile
D. basophile
E. acidophile
E
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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.
Your colleague is studying a newly discovered organism. She is becoming increasingly convinced that the organism is an arthropod. You find that you must respectfully disagree when you note that the organism has a set of distinctly nonarthropod characteristics. The features that cause you to exclude the organism from the arthropod grouping are
A. jointed legs, ecdysis, and an exoskeleton. B. antennae, six legs, and mandibles. C. compound eyes, book lungs, and a hemocoel. D. Malpighian tubules, ommatidia, and tagmata. E. pseudocoel, closed circulatory system, and ventral heart.
This image shows _____
1.passive transport
2.exocytosis
3.endocytosis
4.pseudopods surrounding a pathogen
The evolutionary link between unicellular and multicellular life was probably __________.
A. development of a specialized feeding mechanism B. development of a specialized method of waste disposal C. development of colonial forms where unicellular protists stuck together D. development of a specialized method of gas exchange