What is the role of nucleotides in dna structure?

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

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

9. wind power creates pollution. water air soil noise