What type of motor neuron stimulates skeletal muscle fibers to contract by the excitation-contraction mechanism?
A) upper motor neuron B) interneuron
C) ?-motor neuron D) ?-motor neuron
Answer: C
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The relatively constant temperature of the deep, internal region of a homeotherm is known as the __________ temperature
Fill in the blank with the correct word.
The mucous membrane or mucosa of the respiratory system
A) is present as the lining of the alveoli. B) consists of respiratory epithelial cells overlying a layer of loose connective tissue, the lamina propria. C) contains an epithelium that differs from that of the larynx. D) surrounds a thick layer of connective tissue, the submucosa. E) None of the answers are correct.
The structural RNA of ribosomes is a
A. codon. B. gene. C. proenzyme. D. pre-mRNA. E. ribosomal RNA (rRNA).
Germ cells have ________ unpaired chromosomes and are thus called ________ cells
A) 23; diploid B) 46; diploid C) 23; haploid D) 46; somatic E) 23; somatic