Some restriction enzymes cut at specific and unambiguous sequences (e. g., noti at gcggccgc). as such, the distance between two such sites in a large random dna sequence is 48, assuming a 50% g+c dna content. however, the sequence recognized by xhoii is said to be ambiguous (pu-gatc-py, where pu = any purine and py any pyrimidine). what, therefore, is the expected distance between two xhoii sites in a large random sequence? a) 4 × 4 × 4 × 4b) 1 × 4 × 4 × 4 × 4 × 1c) 2 × 4 × 4 × 4 × 4 × 2d) 46e) 42 × 22

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

This is the process of making a prediction based on the results of prior observations of similar events.

Where is pericardial fulid located