Outline three properties of genes for which the Watson–Crick model offers an explanation
What will be an ideal response?
First, genetic information is stored in the sequence of bases in the DNA. Second, the model explains how any change in the linear sequence of bases in DNA can result in a mutation that produces an altered phenotype. Last, the complementary sequences of the two strands explains how DNA is copied before each cell division.
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At what month of gestation can the fetus detect sound and light?
a. first b. third c. fourth d. seventh e. ninth
Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?
A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin B) nucleosome ? looped domains ? chromatin fiber ? heterochromatin C) heterochromatin ? nucleosome ? chromatin fiber ? looped domains D) chromatin fiber ? heterochromatin ? nucleosome ? looped domains E) chromatin fiber ? nucleosome ? looped domains ? heterochromatin
Four of the five answers listed below reflect how humans have disturbed the balance of the global nitrogen cycle
Which is the exception? a. use of fertilizer b. combustion of fossil fuels c. airplane travel d. coal-fired power plants e. overuse of refrigerants
Friedrich Wöhler refuted the scientific concept of vitalism during the early 1800s by proving that organic molecules could be synthesized outside a living organism.
Answer the following statement true (T) or false (F)