Even though both lens cells and liver cells have numerous transcription factors that are present in both cells, the lens cell makes the crystallin protein (not albumin), whereas the liver cell makes albumin

(not crystallin). Which of the following explains this cell specificity?

a) Different specific transcription factors made in each cell

determine which genes are expressed.

b) At fertilization, specific cells are destined for

certain functions.

c) The activators needed for expression of the crystallin gene are

present in all cells.

d) The promoters are different for the different genes.

This is so important ugh its 25 points

What are two examples of conduction that we use everyday

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.