Components of the first line of defense include all of the following, except
A. the tough cell sheet of the upper epidermis of the skin.
B. the flushing action of tears and blinking.
C. nasal hairs.
D. the flushing action of urine.
E. phagocytic white blood cells.
Answer: E
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What is the definition of a species cluster?
a. a group of closely related species with a common ancestor b. a group of species that developed host races c. a group of species that exhibit polyploidy d. a group of totally unrelated species living in a common habitat e. when allopatric and parapatric speciation occur together
During protein synthesis, ribosomes:a
attach to the mRNA molecule and travel along its length to produce a polypeptide. b. attach to the DNA molecule and travel along its length to produce an mRNA molecule. c. translate mRNA into tRNA. d. transcribe DNA into mRNA. e. translate tRNA into protein.
The most common reportable disease in the United States is
A) cystitis. B) lymphogranuloma venereum. C) gonorrhea. D) syphilis. E) candidiasis.
What happens if the hammer orchid flowers late?