42) Which of the following molecular structures contain codons? A) a protein B)

Question

42) Which of the following molecular structures contain codons? A) a protein B) mRNA C) tRNA ntified DNA as the molecule responsible for transmitting heritable traits, nation was transferred from the DNA in the nucleus to the site of protein D) rRNA 43) Once researchers ide synthesis in the cytoplasm. Which following statements of information transfer i e whih of the following statements correctly describes the mechanism of information transfer in eukaryotes that accomplishes this task? where it serves as a A) DNA from a single gene is replicated and transferred to the cytoplasm, template for protein synthesis. B) Messenger RNA is transcribed from a single gene and transfers information from the DNA in the nucleus to the cytoplasm, where protein synthesis takes place. C) Histone proteins in the chromosomes transfer information from the nucleus to the ribosome, where protein synthesis takes place. D) Transfer RNA takes information from DNA directly to a ribosome, where protein synthesis takes place. 44) According to the central dogma, what is the intermediate molecule involved in the flow of information in a cell that should go in the blank? DNA Proteins A) mtDNA B) rRNA C) mRNA D) tRNA 45) Codons are three-base sequences in mRNA that specify the addition of a single amino acid to the growing protein chain during translation. How do eukaryotic codons and prokaryotic codons compare? A) Prokaryotic codons usually contain different bases than those of eukaryotes. B) Prokaryotic codons usually specify different amino acids than those of eukaryotes. C) The translation of codons is mediated by tRNAs in eukaryotes, but translation requires no intermediate molecules such as tRNAs in prokaryotes. D) Codons are a nearly universal language among all organisms. 46) Which of the following processes occurs in prokaryotes but not in eukaryotes? A) post-transcriptional splicing B) transcription and translation occur simultaneously C) translation in the absence of a ribosome D) gene splicing

Explanation / Answer

42 - The correct answer is option B that is mRNA.

mRNA has sequence of triplet nucleotides that are codon and act as precursor for protein synthesis.

43 - The correct answer is option B that is messenger RNA is transcribed from a single gene and transfers information from the DNA in the nucleus to the cytoplasm, where protein synthesis takes place.

DNA is first replicated into the nucleus and then transcribed to mRNA in the nucleus only. Then MRNA is processed and then transferred to cytoplasm and then this piece of mRNA act as template for protein synthesis.

43 - The correct answer is option C that is mRNA.

45 - The correct answer is option D that is codons are a nearly universal language among all organism.

All organsims code for same amino acid from the codon and protein synthesis requires tRNA in each and every organism.

46 - The correct answer is option B that is transcription and translation occur simultaneously as prokaryotes have polycystronic MRNA they synthesis mrna and protein simultaneously while eukaryotes have different processes as they to process mRNA.

A occurs in eukaryotes but not prokaryotes. So, it is a wrong answer.

C does not occur in anyone. So, C is also wrong

D occurs in eukaryotes but not prokaryotes because prokaryotes don't have introns.

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