ACCCCGATTCA. The polypeptide encoded by this gene has how many amino acids A) 12

Question

ACCCCGATTCA. The polypeptide encoded by this gene has how many amino acids A) 12 6) Suppose one strand of a "mini-gene" has the following base sequence: D) 2 B) 6 C)4 7) 7 The universal regulatory mechanism in eukaryotes for controlling gene expression includes A) control of polypeptides after they have been synthesized but before they are functional B) Control of the genes transcribed and the rate they are transcribed. C) control of the processing of mRNA after it is transcribed from DNA but before it leaves the nucleus, and control of the rate it leaves the nucleus. D) control of mRNA in the cytoplasm after it leaves the nucleus, including changes to mRNA before translation begins. E) All of these mechanisms are used; there is no single universal mechanism. 8) Which of the choices is coded for by the shortest piece of DNA? 8) A) a protein having 40 amino acids C) a tRNA having 75 nucleotides B) a mRNA having 100 nucleotides D) a mRNA having 50 codons 9) An activator is to an enhancer as a(n), is to a silencer 9) _ A) inducer B) repressor C) RNA polymerase II D) transcription factor E) mediator 10) The transcription process in a eukaryotic gene directly produces 10 A) mRNA B) protein. C) rRNA. D) pre-mRNA. E) DNA 1) MicroRNAs (miRNAs) A) are cut by an enzyme called transcriptase. B) silence the expression of specific mRNAs. C) are found only in animals. D) are long RNA molecules.

Explanation / Answer

6.(C) As the given sequence having 12 nucleotide sequence and each triplet encodes an amino acid .So it will encodes 4 amino acids.

7.(E) Control of gene expression in case of eukaryotes is at the level of transcription,post - transcription and at the level of protein synthesis and also post translational modifications.

8.(D) Shortest piece of DNA involves the mRNA of 50 nucleotides as the mRNA of 50 nucleotides means that it is formed from the 50 nucleotides of DNA, which correspond to the shortest among the others.

9.(B)Activator is generally an enhancer as it increase the rate of transcription while repressor is a silencer that slow down the transcription rate.

10.(A) Transcription refers to the synthesis of mRNA from the DNA .

11.miRNA refers to the micro-RNA that is encoded by RNA polymerase 2 and it silences the mRNA by binding with it.

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