A mature, activated B cell is called a
A. dendritic cell.
B. natural killer cell.
C. plasma cell.
D. spleen cell.
Answer: C
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Answer the following statements true (T) or false (F)
1. Cells can sense changes in the environment through alterations in the extracellular matrix. 2. Wrinkling observed with aging is do to low production of the extracellular matrix molecule, fibronectin. 3. Blood vessels that can expand and contract are largely composed of collagen as a structural extracellular matrix protein. 4. Glycosaminoglycans and proteoglycans resist compression and are found in large abundance in joints of the body. 5. Cellulose from the cell wall is a primary energy store for plants.
In every physical or chemical change, energy cannot be created nor destroyed. This is the ________ law of thermodynamics.
Fill in the blank(s) with the appropriate word(s).
Which of the following tests allows the separation of cells according to their sizes, densities, and surface markers tagged by specific fluorescent antibodies?
A. Western blot B. ELISA C. Fluorescence-activated cell sorter D. FA test on a microscope slide
The unique feature of HeLa cells that make them
important for research is that a. they are identical to all other human cells. b. they are immortal cells and will grow in culture. c. they are limited in growth cycles. d. they are like stem cells. e. all of these make them important.