dilation of the __ causes the lacunae to fill with blood and the penis to become erect
Fill in the blank(s) with the appropriate word(s).
deep arteries
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This lineage of Echinoderms is made up of sea cucumbers, which are elongated along their oral-aboral
axis and have a well-developed circulatory system.
a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea
Continued exposure to allergens may result in
a. inflammation of the lining of the respiratory tract due to production of histamine and cytokines. b. increased mucous secretion. c. constricting of the airways. d. sneezing. e. all of these
Two proteins associated with a rare neurodegenerative disorder have been sequenced. Protein A contains many polar amino acids with small regions containing nonpolar, hydrophobic amino acids
Protein B is rich in nonpolar, hydrophobic amino acids with only two small regions containing polar amino acids. What might this suggest about the two proteins? A) The two proteins may have different secondary structures. B) Protein A is fibrous and Protein B is globular. C) Protein A may be a cytoplasmic protein and Protein B may be a membrane associate protein. D) Protein A and Protein B are complementary parts of a supramolecular structure. E) Protein A is most likely and enzyme and Protein B is most likely a storage protein.
Organisms containing DNA from an outside source are called
A. hybrid organisms. B. compound organisms. C. transgenic organisms. D. transcribed organisms. E. plasmid organisms.