Enzymes catalyze chemical reactions by lowering the ___________. Type the best answer into the text box below:

If both glucose and lactose levels were high in the bacterial cell, how would the expression of the lac operon be affected?

Proteins interact with their ligand or substrate at a specific spot on their surface, called a(n) _________. Type the best answer into the text box below:

If an organism’s DNA contains 23% adenine, what is its percentage of cytosine?

Proteins have an ideal or __________ temperature and pH at which it has its ideal structure and highest level of activity. Type the best answer into the text box below:

This measurement of concentration is defined as the number of moles of solute per liter of solvent.

The passive movement of solutes from a place of high concentration to a place of low concentration is called _________.

Study the diagram below carefully.  It shows a cell membrane (tan) separating the extracellular fluid (A) from the intracellular fluid (B). The small circles represent polar solutes dissolved in water. Use the pull-down menus below to insert the best, technical terms into the following sentences to make them true: In the above diagram, water will move across the plasma membrane by the process of [blank1].  For the situation seen above, water will move [blank2] the cell.  The inside of the cell above would be considered [blank3], relative to the outside of the cell.  If the cell above is an erythrocyte, it will eventually [blank4] in this solution.

If a K+ channel opens in the plasma membrane, those ions will flow out of the cell by facilitated diffusion.

Refer to Case Study: Mr. Esposito reports experiencing “pins and needles” feelings in both feet.  He is describing: