If light strikes a photopigment, the photoreceptor cell will decrease the amount of ________ it is releasing
Fill in the blank(s) with correct word
neurotransmitter
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Many signal transduction pathways utilize second messengers to ____
a. transport a signal through the lipid bilayer of the plasma membrane b. relay a signal from the outside of the cell to the inside c. relay a signal from the inside of a cell membrane to the outside of the cell d. decrease the message once the signal molecules have left the receptor e. relay the message from the inner surface of the plasma membrane throughout the cytoplasm
Plants that have leaves arranged in a rosette
A) Have a circular arrangement of leaves and long internodes B) Are low growing because they have no stems whatsoever C) have greatly shortened internodes D) always have compound leaves
The toxin found in Amanita phalloides has deadly effects on humans because it inhibits ____
a. DNA replication b. RNA polymerase c. peptide bond formation d. muscle contraction e. active transport
The fluid mosaic model of cell membrane structure describes a membrane with phospholipids that ________ and proteins that ________
a. can drift laterally / may either be fixed or capable of drifting b. are permeable to water-soluble molecules / spontaneously assemble into two layers c. are fixed in place / can drift laterally d. can drift laterally / are fixed in place