Which intercellular communication type changes membrane permeability? a. enzyme-linked receptor b. ion channel-linked receptor c. transmembrane receptor d. molecular receptor

Sampling lake water for microscopic organisms is not as easy as it sounds when you want to both count and identify species. in a given water sample, your bacteria of choice can be rare or difficult to culture, particularly given the mixture of bacteria in a biofilm. which of the following culture media would be best for growing fecal coliforms when they are relatively less abundant than other bacteria in the lake? anaerobic culture medium enrichment culture medium complex culture medium basic culture medium

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.