Which of the following is the correct sequence of events for muscle contractions?
A) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
B) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
C) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
D) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
B
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A researcher engineers a deletion in the genome of sperm cell DNA that inhibits production of an enzyme in the sperm cell membrane. The researcher then adds the sperm to a culture dish with a secondary oocyte, along with chemicals to guide the sperm to the oocyte. Upon observation, it is found that the sperm fails to penetrate the corona radiata of the oocyte. What enzyme has been deleted from the sperm membrane?
A. Juno B. Catalase C. Acetylcholinesterase D. Hyaluronidase
The genetic information encoded in DNA by the regular alternation of sugar and phosphate molecules
Indicate whether the statement is true or false
The dense fibrous connective tissue portion of the skin is located in the reticular region of the dermis
Indicate whether the statement is true or false
The inability to produce the fluid that keeps most joints moist indicates a disorder of the
A. cruciate ligament. B. synovial membrane. C. articular cartilage. D. bursae. E. mucus membrane.