In the meselson and stahl experiment, the starting escherichia coli culture was grown in heavy (15n) medium; the dna was 15n15n. after two generations of growth in light (14n) medium, the dna of the e. coli cells contained
a) 25% 15n15n dna, 50% 15n14n dna, and 25% 14n14n dna.
b) 25% 15n14n dna and 75% 14n14n dna.
c) 50% 15n14n dna and 50% 14n14n dna.
d) 50% 15n15n dna and 50% 14n14n dna.
e) 50% 15n15n dna and 50% 15n14n dna.

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic.

Which is not true about balanced forces?