A patient is hospitalized with muscle spasms caused by failure of back muscles to relax after contraction. Which of the following would be most likely to help?
A) Inject calcium into the muscle cell, because it is not being released from the sarcoplasmic reticulum.
B) Induce tropomycin and troponin to bind to the myosin binding sites on actin.
C) Increase the amount of acetylcholine at the synapses between motor neurons and muscle cells.
D) Depolarize the motor neurons to send an action potential to the muscle cells.
B
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An experimental test of the hypothesis to explain the origin of the first organic compounds on Earth might include all of the following sequential steps except
A. assembling an atmosphere with H2, CH4, NH3, and H2S. B. placing this atmosphere over liquid water. C. inoculating with a few bacteria to get the process started. D. increasing the temperature of the gases. E. providing energy with electrical spark discharges.
The sequence of genes in each T4 virus within a population is the same but starts with a different gene at the 5' end. If each of these linear pieces is circularized, the gene sequences would be identical. The T4 DNA, therefore, is described as being
A. a linear repeat. B. circularly permuted. C. linearly palindromic. D. two fold rotationally symmetrical.
ATP is formed when ____ the thylakoid
compartment.
a. hydrogen ions enter b. hydrogen ions leave c. electrons leave d. electrons enter e. water is split in
What three plant tissue systems are contained in the stem?
A. root hairs, meristem, and vascular B. dermal, vascular, and ground tissue C. dermal, meristem, and vascular D. dermal, ground tissue, and meristem