Up to 70% of travel-associated gastrointestinal diseases are caused by
A) Salmonella
B) Enterotoxigenic strains of E. coli
C) Shigella dysenteriae
D) E. coli O157:H7
E) Enteroinvasive E. coli
B) Enterotoxigenic strains of E. coli
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Several strains of ________ cause genital warts and cervical cancer
A) human papillomavirus B) Neisseria gonorrhoeae C) Chlamydia trachomatis D) HIV
In humans, a deletion from chromosome 5 typically leads to severe mental retardation and a malformed larynx; this
disorder is known as ____.
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome
Which of the following act as the brakes of the cell cycle and prevent cells from dividing too quickly?
a. oncogenes b. proto-oncogenes c. cyclins d. tumor suppressor genes
Cardiac glycosides, molecules causing a drastic effect on vertebrate heart function, are produced as defensive chemicals by plants belonging to
A. the grass family. B. the mustard family. C. the bean family. D. the poison ivy, oak, and sumac families. E. the milkweed and dogbane families.