Antigen-presenting cells include

A. macrophages.
B. macrophages and B cells.
C. dendritic cells and macrophages.
D. dendritic cells and B cells.
E. macrophages, B cells and dendritic cells.


E. macrophages, B cells and dendritic cells.

Biology & Microbiology

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DNA is cleaved by various restriction enzymes to generate DNA fragments of sizes 543 bp, 517 bp, 396 bp, and 214 bp. Which fragment will move the fastest in agarose gel electrophoresis?

A. 543 bp B. 517 bp C. 396 bp D. 214 bp E. All of the fragments will move at the same speed.

Biology & Microbiology

When blood flows through pulmonary

capillaries, it picks up ___ and releases ___.

a. oxygen---carbon dioxide b. carbon dioxide---oxygen c. oxygen---oxygen d. carbon dioxide---carbon dioxide

Biology & Microbiology

The movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration is referred to as _____________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Animal cells are permeable to water and urea but NOT to sucrose. Initially, the inside of a cell contains 1 M sucrose and 1 M urea and the outside 2 M sucrose and 1 M urea. After the system reaches equilibrium, what changes are observed?

A. The molarity of sucrose would be similar inside and outside the cell and water would move out of the cell causing the cell to shrivel. B. The molarity of urea would be higher outside than inside the cell. C. Water would move out of the cell causing the cell to shrivel. D. The molarity of urea would be higher outside the cell and the molarity of sucrose would be similar inside and outside the cell. E. The molarity of sucrose would be similar inside and outside the cell.

Biology & Microbiology