Cell Communication Formative

Plant cells have ___ for cell to cell communication.

• gap junctions
• plasmodesmata
• desmosomes
• tight junctions

Which is not a part of a signal transduction pathway?

• response

• transcription

• transduction

• receptor

Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?

• phosphorylated tyrosine kinase dimer
• ligand-gated ion channel
• receptor tyrosine kinase
• G protein-coupled receptor

Of the following, a receptor protein in a membrane that recognizes a chemical signal or ligand is most similar to

• a metabolic pathway operating within a specific organelle.
• an enzyme having an optimum pH and temperature for activity.
• tRNA specifying which amino acids are in a polypeptide.
• the active site of an enzyme that binds to a specific substrate.

If a pharmaceutical company wished to design a drug to maintain low blood sugar levels, one approach might be to design a compound

• that increases cAMP production in kidney cells.
• that increases phosphorylation of ADP activity.
• that activates epinephrine receptors for a flight-or-fight response.
• to block G protein activity to slow the production of glucose from glycogen in liver cells.

Tags

NGSS.HS-ETS1-3

Which of the numbers above represent the signal reception?

• 1

• 2

• 3

Which of the numbers above represent the transduction?

• 1

• 2

• 3

Which of the numbers above represent the response?

• 1

• 2

• 3

Ligands can be polar or nonpolar. What is the difference in their receptors?

• The receptor is on the surface of the cell for a nonpolar ligand.

• The receptor is inside the cell for a polar ligand.

• The receptor is on the surface of the cell for a polar ligand.

• There is no difference.

Phosphorylation cascades that involve a series of protein kinases are useful for signal transduction because

• They receive the signal

• They amplify the original signal

• They decrease the number of molecules used

• They are species specific