The sugar in the nucleotide that helps form DNA.

In guinea pigs, black fur (B) is dominant to brown (b) and short fur (S) is dominant to long (s). A heterozygous black, short-furred guinea pig (BbSs) males with a brown long-furred guinea pig.  The expected results are:  

In the double helix model of DNA, the backbone of the twisted “ladder” are composed of phosphodiester bonds between:

Two atoms can become more stable by:

The F2 (second filial) phenotypic ratio of monohybrid cross involving parents that are homozygous dominant and homozygous recessive is:

In garden peas, yellow seed is dominant over green.  If a homozygous yellow-seeded plant is crossed with a green seeded plant, what will be the phenotypic ratio in the second generation after this cross?

Assume that an incompletely dominant gene controls the feather color in chickens so that BB produces black, BW produces a slate-gray color called blue, and WW produces asplashed-white.  A second gene on a separate chromosome controls comb shape, with the dominant gene R producing a rose comb and the recessive genes rr producing a single comb. A homozygous black, single comb-chicken is mated with a homozygous white, rose-comb chicken.  The offspring are the allowed to breed freely among themselves.  What proportion of their offspring (this would be the second filial (F2) generation) would have white feathers and single comb?    

The red blood cells in this figure have been placed in a solution where water flowed into the cells causing them to enlarge and burst. Compared to the red blood cells, the solution was:

The trp operon codes for genes to synthesize tryptophan. It is an example of a(n) _________ operon, because it is ON by default and needs high levels of tryptophan in the environment to turn it off.

All are characteristics of living organisms except they