If a scientist observes a polypeptide chain arranged in a spiral turns that rise upward and held in place by hydrogen bonds, what level of structure arrangement are they looking at?

Explain how scientists use geologic time to determine the age of landforms.

Which statement best describes the role of religion and culture in ancient medicine?

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.