When companies use celebrities in their ads they are using the principle of ________ reference groups.

Jeff had collected a nice wardrobe before graduating from college. All of his friends considered him “well dressed.” After the first day at his new job, however, Jeff immediately went out and replaced most of his clothes with what was considered to be professional dress clothing. Jeff had just experienced the power of a new ________.

Mike and his wife went out shopping for clothes one day. Since Mike always wore SoftSewn brand shirts, his wife picked out only those shirts for him to try on. However, when shown the shirts, Mike said, “I want to try something different.” Mike’s response is an example of _____.

Which of the following types of research is characterized by an indirect means of questioning participants?

Which hypotheses, if any, are null? (select all that apply)

Which hypotheses, if any, have the same outcome variable? (select all that apply)

The major purpose of collecting demographic variables in a research study is to:

How do natural killer (NK) cells identify parasites and damaged host cells to destroy?

Which stage of an infection is designated by #3 in the figure?

Yersinia pestis produces a chemical that binds strongly to host nutrients, notably iron (Fe), thus making the chemical a potent ___.