Give the order in which antigen recognition by T cells occurs. (5points) Antigen fragments bind MHC. Antigen fragment in MHC is displayed on cell surface. MHC-peptide complex is transported to cell surface. Pathogen is taken in by, or infects, a host cell. Encounter with specific T-cell triggers immune response. Host cell enzymes make fragments from the antigen

The sodium-potassium pump in the plasma membrane of cells

According to the graph, B cells will first produce effector cells

Contrast and describe the effect the following conditions have on stomata, and provide an explanation for your choice: (10 points, 5pts each) Rising of the sun in the morning          vs.           Setting of the sun at night

The opening of stomata is thought to involve:

What shape is the earth?

The gastrovascular cavity differs from the alimentary canal in that the gastrovascular cavity __________.

Place the following events of an action potential in the correct order. Na+ channels inactivate and voltage-gated (VG)K+ channels activate, allowing K+ to flow out of the axon, and repolarization begins. An unstimulated neuron has a negative resting membrane potential. The axolemma (the cell membrane of an axon) returns to resting membrane potential. VG Na+ channels open and Na+ enter the axon, causing a depolarization in this section of the axon. Local potentials accumulate to depolarize the membrane at the axon hillock.

Action potentials ______________

Gas exchange in the lungs is due to