In a study, students received rats they believed to be genetically bred as "maze-bright" or "maze-dull" rats. for the next several days, students trained and recorded how long it took for their rats to complete a maze. although the rats were genetically the same breed, the "maze-bright" rats showed improvement in their performance every day, whereas the "maze-dull" rats did not. this study is examining which of the following?
a. reactivity
b. observer bias
c. observer effects
d. socially desirable responding

Oxygen passes through capillary walls and into interstitial space where cells absorb ? a. nitrogen, b. oxygen, c. carbon dioxide, d. metabolic waste

Knowing if a patient has tuberculosis, hepatitis b, or aids is important because a. serious illnesses should be avoided. b. they could compromise the vital sign readings. c. cross-infection may occur. d. they can't be cured.

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.