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

Biology & Microbiology

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Fill in the blank with the appropriate word.

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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

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Glycolysis and the Krebs cycle do not capture all of the energy in a glucose molecule because

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Biology & Microbiology

Freshwater flatworms have this type of system for osmoregulation.

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Biology & Microbiology