The diapsids diverged into the lepidosaurs and the archosaurs. From which of these groups did the snakes arise?
a. archosaurs
b. neither of these groups
c. lepidosaurs
d. There are species of snakes from both of these groups.
c. lepidosaurs
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Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes. Which statement is true?
A. Antibodies produced by the cells can more effectively kill the bacteria. B. The bacterium can survive and replicate inside of the phagocytic cell. C. The bacterium can produce chemicals which can destroy the macrophage housing the bacterium. D. Complement proteins will take over to destroy the bacteria.
A key adhesion molecule is ________, which decreases cell adherence when present in insufficient quantities.
Fill in the blank(s) with the appropriate word(s).
What is a key morphological difference between fish and amphibians?
A. Fish have gills to extract oxygen from water. B. Amphibians have strong muscular and skeletal systems to support their body on land. C. Amphibians have amniotic eggs. D. Fish have a lateral line system.
What component of artery walls allows them to store energy that is later used to maintain continuous blood flow through the circulatory system?
A) collagen B) smooth muscle C) elastin D) endothelium E) skeletal muscle