You recently identified a molecule that you believe is a primary messenger for a signal transduction mechanism. All you know about this ligand is that it is hydrophilic. Where would you expect to find initial interaction of the molecule with its receptor?
A) on the outer surface of the plasma membrane
B) within the cytoplasm of the cell
C) within the nucleus of the cell
D) on the cytoplasmic side of the plasma membrane
E) in endosome vesicles
Answer: A
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_____________________ is defined as the interaction of two or more gene variants to produce a certain phenotype
Fill in the blank(s) with correct word
In order to gain the highest resolution when looking at a cell the best type of microscopy is
A. phase-contrast light microscopy. B. scanning electron microscopy. C. differential-interference light microscopy. D. confocal microscopy. E. fluorescence microscopy.
Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem c. the concentration of nondegradable poisons within organisms at higher trophic levels d. the concentration of degradable poisons within organisms at lower trophic levels e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared to those at lower trophic levels
A network of interactions that involves the
cycling of materials and the flow of energy among organisms and their physical environment is a. a population. b. a community. c. an ecosystem. d. the biosphere. e. the habitat.