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5 Written questions

5 Matching questions

  1. ligand
  2. second messengers
  3. Paracrine Signaling (local)
  4. Synaptic Signaling (local)
  5. Reception
  1. a secreting cell acts on a nearby target cells by discharging molecules of a local regulator (a growth factor, etc.) into the extracellular fluid
  2. b small, non-protein, water soluble molecules or ions
    can readily spread throught the cell by diffusion
  3. c A nerve cell releases neurotransmitter molecules into the synapse, stimulating the target cell
  4. d a molecule that specificlly binds to another molecule, often a larger one
  5. e A chemical signal is detected when signaling molecule binds to a receptor protein located at the cell's surface or inside the cell

5 Multiple choice questions

  1. Specialized endocrine cells secrete hormones into body fluids (often the blood)
  2. process by which a signal on a cell's surface is converted to a specific cellular response
  3. plasma membrane receptors that are characterized by having enzymatic activity
  4. enzyme that transfers phospate groups from ATP to a protein (these include many of the relay molecules in signal transuction pathways)
  5. plasma membrane receptor that works with the help of a G protein
    used by yeast mating factors, epinephrine, other hormones and neurotransmitters
    NOT enzymes
    G-protein is active when bound to a GTP

5 True/False questions

  1. quorum sensingconcentration of signaling molecules allowing bacteria to sense the local density of other bacterial cells


  2. transcription factorsBinding of the signaling molecule changes the receptor protein in some way, initating the conversion of a signal to a form to a form that can bring about a specific cellular response


  3. Biofilmsenzyme that catalyzes the transfer of phosphate groups


  4. cAMP usually direclty activates...?large relay proteins to which other proteins are simultaneously attached


  5. Plant Hormones"controlled cell suicide" cells that are infected, damaged, or have reached the end of their functional life span


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