Amino acid-based hormones use a second messenger, cyclic amp, but steroid hormones

complex inside the nucleus with a receptor and dna to initiate protein synthesis

trigger a response by their buildup along the cell membranes, stopping key materials from entering the cell

must use atp to enter the cell, releasing adp into the cytoplasm, which then becomes cyclic amp

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.