PLZZZ HELP ME ASAP PLZZ! What is the purpose of transcrption?

A) it is the first step in DNA synthesis
B) it is the last step in protein synthesis
C) it is the last step in DNA synthesis
D) it is the first step in protein synthesis

Match the description of each organism to the appropriate category

Hemoglobin is a proton that carries oxygen around your body what is hemoglobin made from

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.