A 27-year-old man has to urinate often and it is painful. A gram-negative, lactose-fermenting bacillus was isolated from the urine in high concentration. Which of the following virulence factors is most important for promoting this disease?
A. Capsule
B. Cholera-like toxin
C. Fimbriae
D. Lipopolysaccharide
E. Shiga-like toxin
Ans: C. Fimbriae
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If you isolate a pancreatic beta cell and put it in the proper growth conditions, it will divide by mitosis and produce new beta cells, but it will not produce pancreatic alpha cells or pancreatic cells that release digestive enzymes. The pancreatic beta cell is
A. totipotent B. impotent C. unipotent D. multipotent E. pluripotent
Red imported fire ants are an invasive species in United States. How have they harmed the Texas horned lizard, which feeds on native ants?
a. They act as parasites on the lizards. b. They are poisonous to the lizards. c. They damage the lizard's breeding area. d. They increase the amount of predatory birds, which eat lizards. e. They have replaced many native ant populations, so the lizards have less food.
DNA and RNA are polymers composed of ________ monomers
A) nucleotide B) carbohydrate C) fatty acid D) amino acid
Which of the following characters was not an ancestral trait that facilitated the colonization of land by an animal group?
a. Amniotic egg b. Exoskeleton of arthropods c. Lungs d. Vertebrate skeleton e. Arthropod cuticle