1. How are keystone species linked to species richness? Provide an example of a keystone species.2. Provide a specific example of how a trophic level in a food chain might occasionally interact with another food chain and in doing so, become part of a larger food web. You may make […]

Mutants Substances E and G are both required for growth in N. crassa. The pathway below indicates the biosynthetic pathway and where, in the pathway, specific mutants are blocked in the pathway. Fill in the table below, indicating whether each intermediate will allow (+) or will not allow (-) growth […]

in a typical growing cell that is dividing once every 24 hours, the equivalent of one new plasma membrane must transit the ER every day. If the ER membrane is 40 times the area of plasma membrane, what is the ratio of plasma membrane proteins to other proteins in the […]

Question: Consider Mendel’s cross of pea plants with smooth, yellow seeds with pea plants with green, wrinkled seed that was reviewed in the Introduction. What if the “S” and “Y” genes were linked (on the same chromosome) instead of independently assorting. Assume that S and Y alleles always are inherited together […]