Blood cells are derived from ______________ stem cells
Fill in the blank with the correct word.
Answer: hematopoietic
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If a cell's membrane is not excitable, this means that ________.
A. the cell cannot be depolarized under any conditions B. the cell does not have a measurable voltage C. the cell cannot vary the permeability of the membrane to specific ions D. the cell is a neuron
Which of the following is not a characteristic of enzymes?
A. They speed up the rate of chemical reactions but are not used up in the process. B. They are most active at temperatures above 53 degrees C. C. Most are proteins. D. They have active sites and interact with specific substrates.
Which paranasal sinus is rarely symmetrical?
A. maxillary B. ethmoid C. sphenoid D. frontal
Membrane protein pores that are essentially always open are called ________ or ________ channels.
Fill in the blank(s) with the appropriate word(s).