AP Biology Unit 4 – Cell Communication Quiz

Which of the following best describes a signal transduction pathway?

• Binding of a signal molecule to a cell protein

• Catalysis mediated by an enzyme

• Sequence of changes in a series of molecules resulting in a response

• Binding of a ligand on one side of a membrane that results in a change on the other side

• The cell’s detection of a chemical or mechanical stimulus

Match the receptor with its mechanism.

• Phosphorylation

• Binding

• Ion influx into the cell

• Dephosphorylation

• ATP synthesis

A steroid hormone binds to an intracellular receptor. When it does, what is the resulting complex able to do?

• Open channels in the membrane for other substances to enter

• Open channels in the nuclear envelope for cytoplasmic molecules to enter

• Mediate the transfer of phosphate groups to/from ATP

• Change gene expression

• Make water-soluble molecules able to diffuse across membranes

Weak ionic bonds formed between the negative phosphate functional group and partially or fully positive amino acids of proteins in a phosphorylation cascade do which of the following?

• Make functional ATP

• Change the shape of a protein from its inactive to its active form

• Change the shape of a protein from its active to its inactive form

• Alter the permeability of the cell’s membranes

• Produce an increase in the cell’s store of inorganic phosphates

Which of the following is an example of signal amplification?

• Production of many molecules by many signal molecules

• Activation of 100 molecules by a single signal binding event

• Activation of a specific gene by a transcription factor

• Activation of an enzyme molecule

• Activation of a receptor by a hormone

If you were studying a cell undergoing lots of active transport, which nucleotide would you expect to find in greatest abundance?

• GTP

• UTP

• TTP

• ATP

• CTP

If you were asked to figure out what a newly discovered receptor was used for, what function(s) might you consider?

• Binding a steroid hormone

• Specialized endocytosis

• Activating a G protein

• Serving as an ion channel

• All of the answers are correct

Which would be the most surprising function of an integral membrane protein in the plasma membrane?

• Connect to cytoskeleton

• Connect to extracellular matrix

• Serve as a motor protein in the cytoskeleton

• Act as a receptor

• Allow ions to pass through the membrane

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