What structural component in skeletal and cardiac muscle conducts action potentials from the outer surface of the muscle fiber inside to the myofibrils?
A. actin
B. tropomyosin
C. troponin
D. transverse tubule
E. None of these.
D. transverse tubule
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In the above figure, which letter points to the urethra?
A) A B) B C) C D) D E) E
Which of the following is NOT an advantage of asexual reproduction?
a. In stable environments, the offspring are as well adapted as the parents. b. Individual organisms do not have to seek mates. c. It is less energetically costly than sexual reproduction. d. It promotes genetic diversity. e. It is faster than sexual reproduction.
Density-dependent factors are related to which of the following?
A) cohort B) dispersion C) Allee effect D) iteroparous E) semelparous
After IRSs bind to the insulin receptor, what binds to them?
a) SH2 domain-containing signaling proteins b) PIP3 c) PIP2 d) PTB domain-containing proteins