The bacterial cell wall is composed of
a) cellulose.
b) glucan.
c) chitin.
d) peptidoglycan.
Ans: d) peptidoglycan.
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Based on figure 16.15, which of the following best explains why toxic shock syndrome peaked in the early 1980s?
a. Some strains of S. aureus developed resistance to methicillin. b. The drug methicillin was invented in the 1980s c. A single strain of S. aureus was responsible for the toxic shock syndrome, and women could not develop immunity to this strain d. Some strains of S. aureus were able to adapt to the new environment produced by ultra-high-absorbency tampons
The type of repetitive DNA composed of sequences of large repeated units is often associated with
A) tandem repeats. B) transposable elements. C) sex-linked genes. D) transcription factors.
Mechanoreceptors are not evenly spaced on your body. What is an advantage of having mechanoreceptors located farther apart?
A) allows often used parts of the human body to feel pressure more severely than areas where mechanoreceptors are closer together B) allows often used parts of the human body to feel pressure less severely than areas where mechanoreceptors are closer together C) allows for greater dendrite regeneration after the body has experienced excessive pressure D) allows for a thicker epidermis than in areas where mechanoreceptors are closer together
Once infected with Trypanosoma brucei, the patient's immune system cannot clear the infection and develop immunity because the parasite
A. has flagella that allow it to travel all over the body. B. matures into infectious trypomastigotes. C. reproduces by binary fission. D. changes its glycoprotein surface antigens every time it replicates. E. invades the central nervous system.