Muscle contraction results from the repeated cycle of interactions between myosin and actin. What is the last step of this cycle, after which the cycle starts over again?
A) New ATP molecules bind to the myosin heads, causing them to disengage from the actin.
B) The myosin heads split the ATP into ADP and Piand store the energy.
C) The myosin head bends (the power stroke).
D) Myosin heads extend toward the Z lines at the ends of the sarcomere.
B
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In a population of lemmings, a sudden freeze that caused many of the lemmings to die is an example of a
A) living and density-dependent factor. B) nonliving and density-independent factor. C) living and density-independent factor. D) normal boom-and-bust cycle. E) nonliving and density-dependent factor.
The part of a neuron that contains a nucleus and other organelles typical of cells is the ________
Fill in the blank(s) with correct word
Which of the following produces the cellulose-digesting enzyme (cellulase) in a cow's digestive tract?
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