T(th) cells recognize antigens when they are bound to a(n)
a. hapten.
b. immunoglobulin.
c. natural killer cell.
d. major histocompatibility complex (mhc) protein.

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Aboy with an extra x chromosome probably has which of the following syndromes?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.