An antiport can be transformed into symport if the orientation of the transporter in the membrane is reversed (i.e. if the portion of the molecule normally exposed to the cytosol faces the outside of the cell instead).

You have identified a novel protein complex that forms a pore across the plasma membrane of a eukaryotic cell. The pore is made of five protein subunits, each of which contributes a membrane-spanning a helix to form the pore. Each a helix has hydrophilic amino acid side chains on one face of the helix and hydrophobic amino acid side chains on the opposite side.What is the likely arrangement of these five a helices in the membrane?

It is acceptable to plagiarize answers to problem set questions.

Cut-and-Run is a technique used to identify genomic DNA sequences bound by a particular protein.

A Positron Emission Tomography (PET) scan visualizes brain activity by imaging energy use. Why does energy use correlate with neural activity?

For each of the following sentences, fill in the blanks with the best word or phrase selected from the provided lists. Not all words or phrases will be used; each word or phrase should be used only once. Affinity chromatographyForward Genetics Gel filtration chromatography GluaseHybridization Ion exchange chromatographyLigaseMultipotent cellsPluripotent cellsPrimary cell cultures Reverse Genetics Reverse Transcriptase Transformed cell linesUnipotent cellsWestern blotting

All membrane transporters carry out active transport.

The difference between detection and resolution is that you can resolve objects that you cannot detect.

You are studying two novel proteins in migratory neural crest cells that you believe physically interact. Which of the following approaches is your best choice to visualize the proximity of these two proteins and evaluate the possibility of their interaction in live cells?

Caribou are adapted to live in the Arctic, which means their cells are functional in extreme cold. Based on your knowledge of cell membranes, which prediction would you make about the lipid bilayer of caribou cells?