What is myelin?
What will be an ideal response?
Ans: a membrane that encloses portions of some neurons and acts as an electrical insulator
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Ruminants have how many chambers in their stomachs?
a. one b. two c. three d. four e. five
Flight requires greater efficiency of oxygen delivery. Therefore, birds have a unique respiratory system that allows them to filter oxygen. During the initial inhalation, the air passes through the trachea and into the . During the second inhalation, the oxygen-depleted gas moves to the , and is then exhaled.
A. posterior air sacs; anterior air sacs B. lamellae of the gills; anterior air sacs C. anterior air sacs; posterior air sacs D. lamellae of the gills; bronchioles E. bronchioles; capillaries
Which of the following receive(s) a physical or chemical stimulus and ultimately cause(s) nerve impulses to be generated in sensory neurons?
A) the brain B) axons C) Schwann cells D) hillocks E) receptors
The three-base sequences on mRNA that code for a particular amino acid are called ___________
Fill in the blank(s) with the appropriate word(s).