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5 Written Questions

5 Matching Questions

  1. Paracrine Signaling (local)
  2. protein phosphates
  3. apoptosis
  4. ligand-gated ion channel
  5. transcription factors
  1. a control which genes are turned on (which gense are transcribed to mRNA) ex. testosterone
  2. b 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
  3. c enzymes that can rapidly remove phophate groups from proteins (a process called dephosphorylation)
  4. d "controlled cell suicide" cells that are infected, damaged, or have reached the end of their functional life span
  5. e secreting cell acts on a nearby target cells by discharging molecules of a local regulator (a growth factor, etc.) into the extracellular fluid

5 Multiple Choice Questions

  1. enzyme that transfers phospate groups from ATP to a protein (these include many of the relay molecules in signal transuction pathways)
  2. also called plant growth regulators
  3. A nerve cell releases neurotransmitter molecules into the synapse, stimulating the target cell
  4. Binding 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. process by which a signal on a cell's surface is converted to a specific cellular response

5 True/False Questions

  1. Receptor tyrosine kinasesenzyme that transfers phospate groups from ATP to a protein (these include many of the relay molecules in signal transuction pathways)

          

  2. Intracellular Receptorsfound 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. liganda molecule that specificlly binds to another molecule, often a larger one

          

  4. Responsetransduction signal finally triggers some sort of response

          

  5. Hormonal Signaling (long-distance)A nerve cell releases neurotransmitter molecules into the synapse, stimulating the target cell

          

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