Which of the Following Is a Reason Why Experiments May

question 110

Multiple Choice

Which of the following is a reason why experiments may be hard to administer?

• A)It may be impossible to control for the effects of the extraneous variables.
• B)Competitors may deliberately contaminate the results of a field experiment.
• C)Both A and B are reasons why experiments may be hard to administer.
• D)Neither A nor B is a reason why experiments may be hard to administer.

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Definitions:

Cytokines

Small proteins released by cells that have a specific effect on the interactions between cells, on communications between cells or on the behavior of cells.

Cell Walls

Rigid or semi-rigid structures that surround the cell membrane of some cells, providing structural support and protection.

T Cytotoxic Cell

A type of T lymphocyte that kills cancer cells, cells that are infected (particularly with viruses), or cells that are damaged in other ways.

CD8

A glycoprotein found on the surface of some T-cell subsets, functioning as a co-receptor in the T-cell receptor (TCR) complex that recognizes antigens presented by MHC class I molecules.