Which of the following attaches the end of the muscle to a bone?
A) synergistic
B) tetanus
C) ligaments
D) tendons
D
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Clues from geology and paleontology suggest that simple cells, or their precursors, arose about _____ years ago.
A. 6 million B. 4 billion C. 2 billion D. 1 million E. 3 million
Answer the following statements true (T) or false (F)
1.A graded potential allows for variable, rather than all-or-none responses, in neurons. 2.During an action potential, sodium ions pour into the cell. 3.The purpose of the nodes of Ranvier is to start nerve impulses. 4.A nerve impulse does not spread backwards because of a refractory period in which the membrane reestablishes its resting potential and cannot generate another action potential. 5.The reason that we can tell light from sound is because different neurons transmit different stimuli.
Which of the following statements is false?
a. Shark’s teeth are modified scales that are continuously shed and replaced. b. Many fish use a swim bladder to provide buoyancy control. c. The bony fishes were the ancestors of the cartilaginous fishes. d. The ray-finned fishes are the most numerous and diverse of the fish groups. e. The lobe-finned fishes are represented today only by the coelacanths.
To use the normal distribution to calculate the p-value of a hypothesis test involving the population mean, which assumption is not necessary?
A. The null hypothesis is zero. B. The sample is random. C. The sample is "large" enough (e.g., larger than 30). D. None of the answers is correct.