Why is the ozone layer crucial to life on earth

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The ozone layer protects humans and other forms off life from the dangerous UV Rays of the sun. Without the ozone layer humans would not exist

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in a second experiment, the plasmid contained the gene for human insulin as well as the amp gene. which of the following best pl

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IV only

Plate IV will only have the trangenic E Coli hence will have the highest percentage of bacteria that are expected to produce insulin.

Explanation:

The transgenic E. coli will have taken up the plasmid with the insulin and amp genes hence they will be able to survive and grow in amplicilin antibiotic.

In plate IV, the wild type E. coli will be eliminated by the antibiotic (because they do not have the gene for resistance) hence providing no competition for resources, in the agar, with the transgenic E coli. This will ensure optimal growth for the transgenic E coli even, than in plate III, producing highest percentage of insulin.

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3 years ago

a sequence of amino acids called a blank is produced during the process of blank during this process, the blank of a TRNA molecu

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Answer:

A transfer RNA (abbreviated tRNA and formerly referred to as sRNA, for soluble RNA is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length,that serves as the physical link between the mRNA and the amino acid sequence of proteins. Transfer RNA does this by carrying an amino acid to the protein synthetic machinery of a cell (ribosome) as directed by the complementary recognition of a 3-nucleotide sequence (codon) in a messenger RNA (mRNA) by a 3-nucleotide sequence (anticodon) of the tRNA. As such, tRNAs are a necessary component of translation, the biological synthesis of new proteins in accordance with the genetic code.

Each mRNA molecule is simultaneously translated by many ribosomes, all reading the mRNA from 5′ to 3′ and synthesizing the polypeptide from the N terminus to the C terminus. The complete mRNA/poly-ribosome structure is called a polysome.

tRNAs in eukaryotes

The tRNA molecules are transcribed by RNA polymerase III. Depending on the species, 40 to 60 types of tRNAs exist in the cytoplasm. Specific tRNAs bind to codons on the mRNA template and add the corresponding amino acid to the polypeptide chain. (More accurately, the growing polypeptide chain is added to each new amino acid bound in by a tRNA.)

The transfer RNAs (tRNAs) are structural RNA molecules. In eukaryotes, tRNA mole are transcribed from tRNA genes by RNA polymerase III. Depending on the species, 40 to 60 types of tRNAs exist in the cytoplasm. Serving as adaptors, specific tRNAs bind to sequences on the mRNA template and add the corresponding amino acid to the polypeptide chain. (More accurately, the growing polypeptide chain is added to each new amino acid brought in by a tRNA.) Therefore, tRNAs are the molecules that actually “translate” the language of RNA into the language of proteins.