Chargaff\'s rules states that the amount of DNA base pairs (G. C and A. T) varie
ID: 299982 • Letter: C
Question
Chargaff's rules states that the amount of DNA base pairs (G. C and A. T) varies from species to species Chargaff's rule states the G= C and that A=T Gene expression includes the process of making an RNA transcript from DNA Gene expression includes the processes of utilizing the transcript in the production of protein. Three types of RNA (mRNA tRNA &) are required for translation The genetic code is nearly universal (used and understood by all life forms on this planet) The primary structure of a protein Is directly encoded by the DNA The DNA code is considered unambiguous because a given codon only specifies one ammo acid More than one codon can specify the same amino acid Multiple Choice Transcription: Is the process of making an RNA copy of the DNA code Is accomplished by complimentary base pairing between DNA and RNA nucleotides Takes place in the nucleus in eukaryotes Requires ribosomes a, b, and c are correct Translation: Is the process of making an RNA copy of the DNA code Is accomplished by complimentary base pairing between DNA and RNA nucleotides Takes place in the nucleus in eukaryotes Requires ribosomes a, b, and c are correct Which of the following statements about the Genetic Code is NOT true? The Genetic Code is virtually universal The Genetic code is a triplet code Multiple codons may encode the same amino acid A given codon will never code for more than one amino acid. None (All of the above statements are true).Explanation / Answer
1. True. In eukaryotic cells, transcription occurs in the nucleus and translation occurs in the cytoplasm.
2. The chargaff's rule states that in DNA, the larger bases called purines (A +G) exist in 1:1 ratio with smaller bases called pyrimidines (C + T), no matter what the species is. However, the relative amounts of A, G,C and T vary between individual and species . So the above statement is false.
3. The above statement is false. Explanation is given in the answer 2.
4. True. Gene expression is the process by which information from gene is used in the synthesis of a functional gene product. The products are often proteins, but in non-protein coding genes such as tRNA or rRNA or in snRNA genes, the product is functional RNA.
5. True. The Gene expression involves transcription and translation. Transcription is the formation of mRNA while translation is the formation of proteins from the mRNA transcript.
6. True. The three types of RNA each encoded by its own gene helps in the translation. The mRNA encodes the amino acid sequence of a polypeptide, the tRNA brings amino acids to ribosomes during translation while the rRNA makes up the ribosomes.
7. This is true because all the organisms on the earth are evolved form a common ancestor which used this same genetic code.