Cell Communication

Which of the below is not a step in signal transduction pathway

• Activation
• Reception
• Response
• Transduction

What is the name of the stretch of DNA where RNA polymerase binds?

• operator
• promoter
• enhancer
• origin

What class of macromolecules are transcription factors?

• carbohydrates
• nucleic acids
• proteins
• lipids

Which of the following would be an example of paracrine signaling in animals?

• neurotransmitter acetylcholine
• hormone epinephrine
• neurotransmitter norepinephrine
• growth factor

A signal molecule that binds to a plasma-membrane protein is a

• ligand
• second messenger
• protein kinase
• receptor protein

What is a G protein?

• specific type of membrane-receptor protein
• protein on the cytoplasmic side of a membrane
• membrane-bound enzyme
• relay protein

Which of the following can activate a protein by transferring a phosphate group to it?

• cAMP
• G Protein
• protein kinase
• protein phosphatase

What do second messengers do?

• transport a signal through the lipid bilayer
• relay a signal from the outside to the inside of the cell
• relay message from the inside of the mebrane throughout the cytoplasm
• dampen the message

What is a function of the second messenger IP3?

• bind to and activate protein kinase A
• activate transcription factors
• convert ATP to cAMP
• bind to and open ligand-gated channels

Which of the following is involved in many human medicines for disease?

• cAMP
• Calcium concentration
• G-protein pathways
• receptor tyrosine kinases