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
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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.
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)
The cell walls of fungi are made up of polysaccharides including
A. phospholipids. B. polyglycans. C. chitin. D. glycolipids. E. bilipid layers.
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.