Existem milhares de tipos de proteínas diferentes nos organismos vivos. analise os itens a seguir: i- na sua capacidade de desnaturação. ii- na sequência em que os aminoácidos estão unidos na cadeia polipeptídica. iii- tipos de aminoácidos presentes na cadeia polipeptídica. iv- na quantidade de aminoácidos na cadeia polipeptídica. da análise dos itens, é correto afirmar que as diferenças entre as proteínas se deve: somente ii, iii e iv são verdadeiros. somente ii é verdadeiro. somente iii é verdadeiro. somente i é verdadeiro. somente i, ii e iv são verdadeiros.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.