During Mendel's time, a widely accepted theory called ____ suggested that evolution occurred in spurts rather than by

gradual change.



a. catastrophism
b. uniformitarianism
c. mutationism
d. natural selection
e. genetic transformation


ANSWER: c

Biology & Microbiology

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Extracellular molecules activating membrane proteins that in turn activate molecules inside the cell that control differentiation is an example of signal ____

Fill in the blank with the appropriate word.

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Exposure to which of the following chemicals is correlated with low birth weight and premature birth?

A) the plasticizer di(2-ethylhexyl)phthalate (DEHP) B) bisphenol A (BPA) C) the synthetic estrogen diethylstilbestrol (DES) D) polychlorinated biphenols (PCBs)

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The cell walls of fungi are made up of polysaccharides including

A. phospholipids. B. polyglycans. C. chitin. D. glycolipids. E. bilipid layers.

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Toxoids

A. are always genetically engineered. B. contain modified bacterial exotoxin molecules. C. confer passive immunity. D. contain select antigenic components of a pathogen rather than whole cells or viruses. E. All of these choices are correct.

Biology & Microbiology