Problem 10.23 in book: There are 3.4 billion base pairs lined up end to end in one human DNA molecule, which contains the entire genetic code for the makeup of an individual person. Each base pair measures approximately 350 pm in length, and almost every cell in the body contains two complete DNA molecules. (a) If one DNA molecule was stretched end to end, how far would it stretch

Which of the following is not a way in which a vascular plant's xylem and phloem are similar?

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.