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.

Indicate whether the following statements about the biases in the fossil record are true or false. a) inland species are more likely to be preserved than marine species b) organisms with hard body parts are more likely to be preserved than are those composed soft tissues. c) species that existed over a larger area are more likely to be preserved than species existing over a smaller area. d) organisms that lived very long ago are more likely to be found as fossils than organisms that lived relatively recently e) the fossils of larger organisms are more likely to be found than the fossils of smaller organisms

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Apair of fruit flies reproduces and has 1,000 offspring. all 1,000 of the offspring have the alleles gg. what is the most likely combination of alleles for each parent