Aresearcher introduces double-stranded rna into a culture of mammalian cells and can identify its location or that of its smaller subsections experimentally, using a fluorescent probe.

38) some time later, she finds that the introduced strand separates into single-stranded rnas, one of which is degraded. what does this enable the remaining strand to do?

a) attach to histones in the chromatin

b) bind to complementary regions of target mrnas

c) activate other sirnas in the cell

d) bind to noncomplementary rna sequences

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

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.

Construct at least two possible hypotheses for the student’s experiment.