While ice skating, you fall down and bruise your coccyx. The next day, after hearing about your mishap, your friends bring you a variety of gag gifts. Which of these would actually be useful?
a. helmet
b. elbow pads
c. donut pillow
d. eyepatch
c. donut pillow
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The brightly colored whorl of flower parts that are specialized for attracting animal pollinators are the ____
Fill in the blank with the appropriate word.
Which of the following represents the correct sequence of cell types through which an electrical signal would pass in a reflex arc?
A. sensory neuron ? interneuron in the CNS ? motor neuron B. motor neuron ? interneuron in the PNS ? sensory neuron C. sensory neuron ? motor neuron ? interneuron in the CNS D. motor neuron ? sensory neuron ? interneuron in the PNS E. sensory neuron ? motor neuron ? interneuron in the CNS
Which of the bone development lineages is incorrect?
A. white blood cell progenitors ? monocytes ? osteoclast B. undifferentiated mesenchymal cells ? osteocyte ? osteoblast C. undifferentiated mesenchymal cells ? fibroblast ? collagen D. undifferentiated mesenchymal cells ? chondroblast ? chondrocyte E. undifferentiated mesenchymal cells ? osteoblast ? osteocyte
Which of the following is a by-product of the catabolism of proteins?
A) lactic acid B) acetyl-CoA C) proteases D) ammonia E) carbon dioxide