Cells CANNOT communicate with each other by means of _______
a. gap junctions.
b. plasmodesmata
c. a molecule that diffuses through the extracellular fluid.
d. desmosomes.
e. hormones
D
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Twin studies have been used to assess the relative importance of "nature" versus "nurture" in determining variation among individuals for complex traits. Which of the following statements is not correct?
A. In principle, identical twins differ only because of environment. B. In principle, fraternal twins differ because of genotype and environment. C. Twin studies show that autism and clinical depression are not significantly influenced by genotype. D. The extent to which fraternal twins differ more from each other than identical twins differ from each other measures the effects of genotype. E. Identical twins reared apart compensates for environmental influences that may be stronger for identical twins compared to fraternal twins.
You wish to determine if cytosolic calcium fluxes are associated with signal transduction in a particular cell type. One means of observing the calcium fluxes would be to utilize
A) caspases. B) cytochrome c. C) nitric oxide. D) radioactive cAMP. E) cameleons.
With ____, individual cells can be coaxed to divide and form embryos in a laboratory
a. in vitro fertilization b. sexual reproduction c. tissue culture propagation d. vegetative reproduction e. grafting
Which is incorrect about histoplasmosis?
A. Respiratory infections range from mild to severe. B. Histoplasmosis never spreads to sites outside the respiratory tract. C. It is transmitted by inhalation of spores. D. The pathogen grows inside macrophages. E. Chronic cases have symptoms similar to tuberculosis.