Sickle cell anemia is a disease whose phenotype includes not only anemia, but damage to many different organs. all phenotypes, however, can be traced to a single gene. this is an example of

The answer is pleiotropy

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Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes 

There are four nitrogenous bases that make up dna. the two pyramidines are thymine and cytosine. the two purines are adenine and guanine. these bases pair in a very specific way. adenine - thymineguanine - cytosine i remember it like this: a tall, good cat.