*Question*
Q: The distance between two consecutive z discs or z lines is called what? Choices: - contractile - ligule - radius - sarcomere A:
**Answer**
sarcomere

*Question*
Q: Obligate anaerobes live and grow in the absence of what? Choices: - molecular carbon - molecular nitrogen - atomic oxygen - molecular oxygen A:
**Answer**
molecular oxygen

*Question*
Q: What hormone, which is associated with luteinizing hormone and male sexuality, helps bring about physical changes in puberty? Choices: - steroids - epinephrine - estrogen - testosterone A:
**Answer**
testosterone

*Question*
Q: Which system consists of all the bones of the body? Choices: - circulatory system - nervous system - digestive system - skeletal system A:
**Answer**
skeletal system