Anonymous
06-04-2004, 10:33 PM
Problem 12: Information transfer to the cytoplasm
Which of the following molecules functions to transfer information from the nucleus to the cytoplasm?
A. DNA
B. mRNA
C. tRNA
D. proteins
E. lipids
Information flow The "central dogma" of information flow in molecular biology is illustrated in the figure. Direction of information flow is shown by the colored arrows. DNA encodes the information of the genome, which is copied during DNA replication. In eukaryotic cells, DNA replication occurs in the nucleus, where the chromosomes reside.
http://www.biology.arizona.edu/molecular_bio/problem_sets/mol_genetics_of_eukaryotes/graphics/13t.gif
Transcription
Genetic information in converted to RNA during the process of transcription. In eukaryotes, transcription occurs in the nucleus. Following RNA processing, RNAs exit the nucleus to the cytoplasm where they are further utilized. mRNAs in particular carry the information for protein sequences. Thus mRNAs are used to convey genetic information from the nucleus to the cytoplasm
Translation
Translation is the synthesis of proteins on ribosomes, where the information for amino acid sequencene encoded in mRNA (and originally in DNA) is retrieved and converted to the sequence of amino acids in a protein.
ans:
B. mRNA
mRNAs exit the nucleus to the cytoplasm where they are translated on ribosomes. Thus mRNAs convey genetic information from nucleus to cytoplasm.
Which of the following molecules functions to transfer information from the nucleus to the cytoplasm?
A. DNA
B. mRNA
C. tRNA
D. proteins
E. lipids
Information flow The "central dogma" of information flow in molecular biology is illustrated in the figure. Direction of information flow is shown by the colored arrows. DNA encodes the information of the genome, which is copied during DNA replication. In eukaryotic cells, DNA replication occurs in the nucleus, where the chromosomes reside.
http://www.biology.arizona.edu/molecular_bio/problem_sets/mol_genetics_of_eukaryotes/graphics/13t.gif
Transcription
Genetic information in converted to RNA during the process of transcription. In eukaryotes, transcription occurs in the nucleus. Following RNA processing, RNAs exit the nucleus to the cytoplasm where they are further utilized. mRNAs in particular carry the information for protein sequences. Thus mRNAs are used to convey genetic information from the nucleus to the cytoplasm
Translation
Translation is the synthesis of proteins on ribosomes, where the information for amino acid sequencene encoded in mRNA (and originally in DNA) is retrieved and converted to the sequence of amino acids in a protein.
ans:
B. mRNA
mRNAs exit the nucleus to the cytoplasm where they are translated on ribosomes. Thus mRNAs convey genetic information from nucleus to cytoplasm.