Tau is a microtubule-associated protein that plays a key role in the development of certain brain disorders. to analyze tau expression, mouse brain extracts are made at different developmental stages, separated on an sds-page gel, and analyzed by western blot with antibodies recognizing only mouse tau protein. if the results at the right represent tau’s normal expression pattern, the two different size protein products could result from:
1. transcription of tau dna in different directions.
2. translation of tau mrnas of different sizes.
3. expression of two different genes.
4. different chemical modifications of tau protein.

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

What are they five steps of cloning?