A. prevent formation of cancer cells.
B. block the ability of cyclins to stimulate cell division.
C. stimulate apoptosis.
D. often stimulate cyclin-dependent kinases that speed up the G1 phase.
During skeletal muscle contraction,
A. the H band increases in size.
B. Ca2+ associates with tropomyosin.
C. myosin heads interact with tropomyosin.
D. thin filaments slide across thick filaments.
Fatty acids provide the majority of the energy for muscle metabolism when a person is
A.exercising at 25% of VO2max.
B.exercising at 50% of VO2max.