Calcium promotes sarcomere contraction by binding
to __________ thus __________.
a. myosin; activating it
b. actin; activating it
c. tropomyosin; causing troponin to move
d. troponin; causing tropomyosin to move
e. myosin; changing its shape
Answer: d
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Energy of motion is ____ energy
Fill in the blank with the appropriate word.
Match the following items with the correct phrases.
_______1. Produced by some strains of Streptococcus pyogenes. _______2. Tetanospasmin is an example. _______3. Its presence in the bloodstream can lead to fever and septic shock. _______4. Produced by Clostridium botulinum. _______5. Produced by Clostridium difficile. a. neurotoxin b. enterotoxin c. diphtheria toxin d. endotoxin e. erythrogenic toxin
Glycolysis and the Krebs cycle do not capture all of the energy in a glucose molecule because
A. ATP easily vaporizes. B. energy cannot be created or destroyed. C. some glucose is not broken down. D. some energy is always lost as heat during chemical reactions. E. some energy remains in the atoms.
Freshwater flatworms have this type of system for osmoregulation.
A. isonephridial B. eunephridial C. protonephridial D. osmonephridial E. metanephridial