The endothelial cells found closest to the site of an infection express proteins called lectins. Each lectin binds to a particular ____________ that is presented on the surface of a target cell
(a) oligosaccharide
(b) aminophospholipid
(c) polysaccharide
(d) sphingolipid
(a)
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Which group of organisms is thought to be responsible for the corrosion of submerged metal structures and oil pipelines?
A) fermentative microorganisms B) acidophilic iron-oxidizers C) sulfate reducers D) hydrocarbon-degrading anaerobes
A researcher is investigating the morphology of complete flowers. Which of the following organs must his flowers contain?
A. calyx, corolla, receptacle, and carpels B. calyx, corolla, carpels, and ovules C. calyx, corolla, stamens, and anthers D. calyx, corolla, carpels, and pistils E. calyx, corolla, androecium, and gynoecium
Hybridization between different species is rare because it ____
a. requires the breakdown of a barrier preventing interbreeding b. causes lethal mutations in hybrid offspring c. leads to the exchange of genes between closely related species
d. leads to gene flow between species e. contradicts the species concept
The probability that two random events will occur together is equal to the __________
a. sum of their individual probabilities b. difference between their individual probabilities c. product of their individual probabilities