Which of the following germ layer-structure is mismatched?
A. mesoderm-notochord
B. endoderm-lungs or respiratory tube
C. ectoderm-epidermis
D. mesoderm-digestive tract
E. ectoderm-brain
D. mesoderm-digestive tract
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What biosafety level is required when working with Staphylococcus aureus and Streptococcus pyogenes?
A. 3 B. 1 C. 2 D. 4
Homologous organs
a. are the results of very different genetic blueprints. b. can have different functions. c. show structural differences in the embryos but are similar in the adult organisms. d. are only found within a species. e. have the same function.
According to the animation, antibodies interact with which innate defenses?
a. Phagocytosis, inflammation, and the complement system b. The complement system c. First-line defenses d. Phagocytosis e. Phagocytosis and the complement system f. Inflammation
Some animal species found in caves have tiny, nonfunctional eyes. These are best described as
A) mutations. B) analogous structures. C) homologous structures. D) vestigial structures.