The haploid human genome contains about 3 × 109 nucleotides. on average, how many dna fragments would be produced if this dna was digested with restriction enzyme psti (a 6-base cutter)? rsai (a 4-base cutter)? how often would an 8-base cutter cleave?
i'm looking for how to work the problem, not just the answer. my guess, to start, is:
4 nucleotides, 6-base cutter; 46 = 4096
( 3x109 ) / 4096 = 73,2421.875
pstl would have aprox. 73k fragments?

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

In the united states there are strict fishing seasons and limits, but not all countries enforce similar laws. in bangladesh there are few if any fishing restrictions. what might be the reason for less restrictions in smaller countries like bangladesh? a) the united states is the only country worried about overfishing. b) the united states wants to limit the supply of fish to increase the price. c) bangladesh and smaller countries have an unlimited supply of fish in their coastal waters. d) small countries, such as bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.