Exam 4: How Cells Work

A protein in the cell membrane is used to transport molecules against their concentration gradient (a process that requires energy). This protein likely also binds to ________ in addition to the molecule it is transporting.

The sequential reaction pathway A à B à C à D is dependent on enzymes for each separate step. The enzyme which has "C" as a substrate becomes nonfunctional. Explain how this affects the metabolic pathway shown.

The illustration below indicates that photosynthesis and cellular respiration are both complementary and balanced. An excess of sugars produced fossil fuels like coal and petroleum; this suggest that in the past,

The image below diagrams the action of an enzyme. Notice that the enzyme is depicted as being more tightly wrapped around the substrates in step 2 than it is in step 1. Why is this?