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.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

i believe the answer would be b. hope it : )