Why are some molecules electrically neutral, whereas others display polarity?
a. Molecules that have lost an electron will have a positive charge.
b. All molecules start off electrically charged, but this charge weakens over time.
c. Relative differences in electronegativity between elements in a molecule result in negatively charged electrons spending more time near some elements than others, resulting in asymmetrical charge distributions.
d. Radioisotopes eject positrons as they decay, becoming more electrically negative over time.
c. Relative differences in electronegativity between elements in a molecule result in negatively charged electrons spending more time near some elements than others, resulting in asymmetrical charge distributions.
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Neurotransmitters are stored in vesicles at the nerve terminal. Assuming a neurotransmitter is a protein, where was it synthesized?
A. the cytoplasm B. the rough endoplasmic reticulum C. the Golgi apparatus D. the lysosome
Endometriosis can lead to infertility by ____
a. preventing oocytes from forming b. preventing maturation of oocytes c. causing the formation of cysts d. causing scarring in the oviducts e. decreasing sperm viability
A molecule that closely resembles the shape of a substrate for an enzyme would most likely serve as a
A. allosteric activator. B. competitive inhibitor. C. allosteric inhibitor. D. noncompetitive inhibitor.
Proteins contain both acidic and basic R groups and can, therefore, function as
A) energy storage macromolecules. B) structural macromolecules. C) buffers. D) catalysts. E) genetic material.