Two DNA sequences, each 48 kb in size, are treated with the same restriction enzyme. There is only one site for this restriction enzyme on each of these sequences. Digests are separated by gel electrophoresis. Sequence A shows ONE band that is 48 kb in size. Sequence B shows TWO bands, one 30 kb and the other 18 kb in size. What can you conclude from these data?A. Sequence A is linear, sequence B is circular B. Both sequences are linear. >X C. They are identical sequencesD. Sequence A is circular, sequence B is linear 0

Sequence A is circular, sequence B is linear.

Explanation:

The restriction enzymes are known as molecular scissors because they cuts the DNA molecules and generator the desired DNA fragment. Two main types of restriction enzymes are exonuclease and endonuclease.

The Genome map can be constructed by the using the restriction enzyme. The circular DNA gives the DNA fragments equal to the digesting site of the restriction enzyme whereas linear DNA give fragments one more than the restriction site of the enzyme. In the given question, Sequence A has one fragment only and Sequence B has two fragments.

Thus, the correct answer is option (D).

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.