Abiologist wants to use a radioactive isotope of nitrogen to radiolabel certain molecules in a culture of cells she is growing. if the biologist incubates her cells with n-15 ( a heavy isotope of nitrogen), which group of macromolecules will be labeled in the culture of cells? a) glucose b)glycogen c)lipids d) proteins

Works together in the synthesis, modification, packaging, and transport of lipids and proteins

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.