Which of the following statements are true for first-order analyses of nmr spectra (the type of analysis most commonly done).
a. the spin-multiplicity of the proton nmr absorption of the methylene group in ethanol-od is 4.
b. the difference in absorption frequency is equal to or less than 6 j.
c. carbon-13, an nmr-active nucleus, has a nuclear spin quantum number of 0.
d. first-order multiplets are symmetrical, and their chemical shift is given by the position of the first peak in the multiplet.
e. the peak multiplicity in a proton spectrum is (n+1), where n is the number of adjacent, equivalent hydrogens.

Enzymes are proteins that speed up reactions by providing an additional energy source supplying additional molecules for the reaction removing inhibitors that slow down reactions lowering the amount of energy required

2. if someone had the list of traits you provided in question 1, do you think he or she would be able to find you in a group of 1000 people? why or why not? if not, what other information encoded in your genes might distinguish you from the others in the group? what are other traits that are encoded for by dna?

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.