__________ are electrically excitable cells that
signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s).
Answer: Neurons
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Each of the following is correct about cholera and its effect on G-protein–adenylyl cyclase activity except
A) Vibrio cholera bacteria colonize the gut. B) Cholera toxin is secreted by Vibrio cholera bacteria. C) Intestinal cells infected with cholera toxin import abnormally high levels of salts and fluids into the bloodstream. D) Cholera toxin alters Gs? so that it no longer hydrolyzes GTP. E) Intestinal cells infected with cholera toxin maintain abnormally high cAMP levels.
Which process is not involved in the hydrologic cycle?
a. nitrification b. transpiration c. precipitation d. evaporation e. condensation
Unequal crossing over during prophase I can result in one sister chromosome with a deletion and another with a duplication. A mutated form of hemoglobin, so-called hemoglobin Lepore, exists in the human population
Hemoglobin Lepore has a deleted series of amino acids. If this mutated form was caused by unequal crossing over, what would be an expected consequence? A) There should also be persons whose hemoglobin contains two copies of the series of amino acids that is deleted in hemoglobin Lepore. B) Each of the genes in the hemoglobin gene family must show the same deletion. C) The deleted gene must have undergone exon shuffling. D) The deleted region must be located in a different area of the individual's genome.
Which of the following statements about organellar movement in the cell is false?
(a) Organelles undergo saltatory movement in the cell. (b) Only the microtubule cytoskeleton is involved in organellar movement. (c) Motor proteins involved in organellar movement use ATP hydrolysis for energy. (d) Organelles are attached to the tail domain of motor proteins.