Multiple Choice Questions

A signal transduction pathway is initiated when a _____ binds to a receptor.
  • signal molecule
  • calmodulin
  • ligand
  • G-protein-linked
The cleavage of glycogen by glycogen phosphorylase releases ______.galactose-1-phosphatenothing: glycogenphosphorylase cannotcleave glycogenfructose-1-phosphatecelluloseglucose-1-phosphate
  • 1. Cortisol passes through the plasma membrane into the cytoplasm2. Cortisol-receptor complex forms in the cytoplasm3. Cortisol-receptor complex enters the nucleus where it bind to genes4. Cortisol-receptor complex acts as a transcription factor5. The transcribed mRNA is translated into a specific protien
  • By binding to DNA it triggers the transcription of a specific gene.
  • 7. glucose-1-phosphate**glycogen is a polysaccharide compose of glucose monomers
  • amplification**By activating many other molecules the initial signal is amplified
Part completeA protein kinase activating many other protein kinases is an example of _____.
  • Phospholipase C ... IP3 .... Ca2**Phospholipase C cleaves IP3 from a membrane protein, and IP3 then binds to a calcium channel on the ER.
  • transduction**Transduction is the 2nd of the 3 stages of cell signaling
  • amplification**By activating many other molecules the initial signal is amplified
  • By binding to DNA it triggers the transcription of a specific gene.
Calcium ions that act as second messengers are stored in _____.
  • G-protein-linked receptor
  • transduction**Transduction is the 2nd of the 3 stages of cell signaling
  • D
  • endoplasmic reticula** The ER stores calcium ions
Part complete_____ catalyzes the production of _____, which then opens an ion channel that releases _____ into the cell's cytoplasm.
  • Phospholipase C ... IP3 .... Ca2**Phospholipase C cleaves IP3 from a membrane protein, and IP3 then binds to a calcium channel on the ER.
  • By binding to DNA it triggers the transcription of a specific gene.
  • amplification**By activating many other molecules the initial signal is amplified
  • 1. Cortisol passes through the plasma membrane into the cytoplasm2. Cortisol-receptor complex forms in the cytoplasm3. Cortisol-receptor complex enters the nucleus where it bind to genes4. Cortisol-receptor complex acts as a transcription factor5. The transcribed mRNA is translated into a specific protien
The process by which a signal is converted to a specific cellular response involves three stages:reception of a signaling moleculetransduction of the signalresponse to the signal
  • 7. glucose-1-phosphate**glycogen is a polysaccharide compose of glucose monomers
  • G-protein-linked
  • 1. Cortisol passes through the plasma membrane into the cytoplasm2. Cortisol-receptor complex forms in the cytoplasm3. Cortisol-receptor complex enters the nucleus where it bind to genes4. Cortisol-receptor complex acts as a transcription factor5. The transcribed mRNA is translated into a specific protien
  • Phospholipase C ... IP3 .... Ca2**Phospholipase C cleaves IP3 from a membrane protein, and IP3 then binds to a calcium channel on the ER.
A signal molecule is also known as a(n) _____.
  • signal molecule
  • ligand
  • Cyclic AMP binds to calmodulin.
  • calmodulin
Part completeWhat role does a transcription factor play in a signal transduction pathway?
  • Phospholipase C ... IP3 .... Ca2**Phospholipase C cleaves IP3 from a membrane protein, and IP3 then binds to a calcium channel on the ER.
  • amplification**By activating many other molecules the initial signal is amplified
  • By binding to DNA it triggers the transcription of a specific gene.
  • transduction**Transduction is the 2nd of the 3 stages of cell signaling
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Multiple Choice Questions
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