A millicurie, a unit of radioactivity, is
a. a tenth of a curie.
b. a hundredth of a curie.
c. a thousandth of a curie.
d. a millionth of a curie.
d
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Most dinosaurs became extinct
a. 10,000 years ago. b. 1 million years ago. c. 500 million years ago. d. 65 million years ago. e. 1 billion years ago.
The structure labeled "C" is the
a. right ventricle. b. left atrium. c. left ventricle. d. trunk of the pulmonary arteries. e. right ventricle
Arrange the following neurons into the correct sequence for information flow during the withdrawal reflex following touching a hot burner on a stove
A) interneuron, motor neuron, sensory neuron B) motor neuron, sensory neuron, interneuron C) sensory neuron, interneuron, motor neuron D) motor neuron, interneuron, sensory neuron
What is a hallmark of passive transport across cell membranes?
a. It requires the use of ATP. b. It occurs along an electrochemical gradient. c. It cannot occur without assistance from an integral membrane protein. d. It occurs along an electrochemical gradient, and may involve the use of transport proteins. e. It may involve the use of transport proteins.