The alpha-helix and beta-pleated sheet are characteristic of:
A) primary protein structure. B) secondary protein structure.
C) tertiary protein structure. D) quaternary protein structure.
Answer: B
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If a muscle fiber were to suddenly and permanently stop producing ATP the fiber would no longer be able to actively transport calcium out of the cytoplasm (sarcoplasm) and the intracellular calcium concentration would rise
Which of the following would you expect to happen? A) The fiber would twitch uncontrollably due to excessive calcium bound to troponin. B) Myosin would be able to bind to the exposed binding sites on thin filaments but it would not be able to detach. C) Calcium would be transported to the sarcoplasmic reticulum therefore contractions would cease. D) No change would occur in a muscle that was relaxed to begin with.
When a blood vessel dilates, resistance through that vessel is ________.
Fill in the blank(s) with the appropriate word(s).
The ____________________ is the normal pacemaker of the heart
Fill in the blank(s) with correct word
What holds the tooth in its socket in the jaw?
A. Enamel B. Root C. Gingiva D. Periodontal ligaments