How are thick and thin filaments involved in muscle contraction?
1.The filaments change length, and myosin moves in the direction of the contraction.
2.The sarcomere lengthens in response to the expansion of Z bands.
3.Actin binds to ATP and breaks it down into ADP and phosphate.
4.Increases in calcium cause a bridge to form between actin and myosin.
4
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Nucleation:
A. describes the process of transporting RecA to the nucleus after translation. B. is the addition of the first few RecA subunits onto single-strand DNA with the help of RecBCD. C. occurs rapidly followed by slow extension of RecA coating of the filament. D. is inhibited by the ATPase activity of RecA. E. is the process by which RecA disassembles from the filament.
Which statement below is true about neurotransmitters?
A. The entry of neurotransmitter through K+ channels into neurons triggers the rising phase of the action potential B. Neurotransmitters are released from muscle cells to activate motoneurons in the presence of botulinum toxin C. Neurotransmitters are released from a neuron when action action potential reaches the end of its axon D. All of the above
Darwin’s finches are found on the __________
Islands. a. Galápagos b. Canary c. Philippine d. Hawaiian e. Aleutian
Two forms of hemophilia are determined by genes on the X chromosome in humans. Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man. What is the probability that their first son will have hemophilia?
A) 1/2 B) 100% C) zero D) 1/4 E) 1/3