The development of a pseudomembrane on the tonsils and throat is characteristic of
A) tuberculosis.
B) pertussis.
C) diphtheria.
D) streptococcal pharyngitis.
E) pneumococcal pneumonia.
Answer: C
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In placental mammals, how does the fetus obtain nutrients and oxygen?
A. Maternal veins and fetal arteries are directly connected in the chorionic villi. B. Diffusion into the umbilical capillaries from maternal blood surrounding the chorionic villi. C. Maternal blood cells are carried across the fetal capillary walls through special pores. D. Maternal arteries and fetal veins are directly connected in the chorionic villi. E. Diffusion into the umbilical cord from maternal blood surrounding the chorionic villi.
What aspect of a population is critical in determining
a species in Ernst Mayer’s “biological species concept”? a. similar physical appearance b. similar patterns of behavior c. capability to interbreed d. common habitat e. similar nutritional requirements
When the diaphragm and rib cage muscles relax
a. the chest cavity enlarges b. inspiration occurs c. expiration occurs d. it is impossible to breathe
ACh regulates neuromuscular junction through (i)______________, which is expressed in skeletal muscle. (ii)_________ is an (iii)_________ of the receptor.
a) (i) ACh nicotinic receptor, (ii) nicotine, (iii) agonist b) (i) ACh muscarinic receptor, (ii) nicotine, (iii) agonist c) (i) ACh nicotinic receptor, (ii) muscarine, (iii) antagonist d) (i) ACh muscarinic receptor, (ii) muscarine, (iii) antagonist