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5 Written questions

5 Matching questions

  1. kinase
  2. Response
  3. protein kinase
  4. Plant Hormones
  5. ligand-gated ion channel
  1. a transduction signal finally triggers some sort of response
  2. b enzyme that transfers phospate groups from ATP to a protein (these include many of the relay molecules in signal transuction pathways)
  3. c enzyme that catalyzes the transfer of phosphate groups
  4. d type of membrane receptor containing a region that can act as a "gate" when the receptor changes shape
    when the signaling molecule bindsas a ligand to the receptor protein, the gate opens or closes, allowing or blocking the flow of specific ions
  5. e also called plant growth regulators

5 Multiple choice questions

  1. secreting cell acts on a nearby target cells by discharging molecules of a local regulator (a growth factor, etc.) into the extracellular fluid
  2. "controlled cell suicide" cells that are infected, damaged, or have reached the end of their functional life span
  3. small, non-protein, water soluble molecules or ions
    can readily spread throught the cell by diffusion
  4. A chemical signal is detected when signaling molecule binds to a receptor protein located at the cell's surface or inside the cell
  5. enzymes that can rapidly remove phophate groups from proteins (a process called dephosphorylation)

5 True/False questions

  1. liganda molecule that specificlly binds to another molecule, often a larger one


  2. G protein-coupled receptorfound in either the cytoplasm or in the nucleus of target cells
    chemical signaling messengers must pass through the membrane to reach this receptor, so the chemical messengers are either hydrophobic, or small enough to cross the membrane (ex. steroid and thyroid hormones in animals)


  3. Intracellular Receptorsplasma 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


  4. Signal Transductoin PathwayBinding 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


  5. Receptor tyrosine kinasesplasma membrane receptors that are characterized by having enzymatic activity


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