In bacteria, single polycistronic MRNA encodes for:

Which of the following is true of the timing of RNA processing?     The premise is false; mRNA processing does not occur in eukaryotes     mRNA processing occurs in the cytosol after pre-mRNA is exported from the nucleus     mRNA processing occurs co-transcriptionally     mRNA processing occurs in the nucleus after transcription has terminated

Which of the following could create different versions of an enzyme? (Select all that apply) Note: by "versions" we mean isoforms with similarity but also some differences in their polypeptide sequence Group of answer choices reciprocal regulation allosteric activation substrate concentration a gene is duplicated and the 2 copies evolve different changes over time alternative splicing

Which would have the most serious effect on polypeptide product?

Which of the following types of mutation that changes the mRNA sequence after the codon that initiates translation is likely to have the most detrimental effect on the polypeptide product? Group of answer choices a substitution of the first nucleotide of a GGG codon a substitution of the third nucleotide in an ACC codon an insertion of a codon a deletion of two nucleotides a deletion of a codon

Which of the following statements about translation is false?     In eukaryotes, the 5' cap and the 3' poly(A) tail are involved in translation initiation.     Peptidyl-transferase activity during translation is the property of a ribozyme.     A base at the first position of an anticodon on the tRNA would pair with a base at the third position of the mRNA.     The growing peptide chain is transferred from the tRNA in the P site to the tRNA in the A site.       Ribosomes move along an mRNA in the 3’ → 5' direction.

Which of the following five processes are points of regulation for controlling enzyme-mediated reactions? Select 5 correct answer(s) Dihydrolipidation of arginine Disulfide bond acetylation Protein targeting RNA processing Cytosine methylation Proteolytic processing Protein degradation

At least three types of RNA are required for protein synthesis. Compare and contrast mRNA, rRNA, and tRNA by moving the descriptions of their structure and function to the appropriate categories. Some phrases may describe all three types of RNA. mRNA in eukaryotes, can exist outside the nucleus acts as an enzyme for peptide synthesis composed of ribonucleic acid rRNA Answer Bank moves amino acids to the site of protein synthesis tRNA contains nucleotide triplets that code for specific amino acids has a convoluted structure with a three-base sequence called an anticodon moves genetic information out of the nucleus and into the cytoplasm mRNA, rRNA, and tRNA

In eukaryotes, which of the following statements is correct with regard to introns and exons? Mature mRNA contains a mix of introns and exons Introns in DNA are removed by spliceosomes Failure to remove introns can lead to production of faulty protein Exons are repeating sequences typically found at the end of a gene Introns are transcribed from promoter sequence

A certain mRNA strand has the following nucleotide sequence: 5AUGACGUAUAACUUU3 What is the anticodon for each codon? What is the amino acid sequence of the polypeptide? (Use Figure 13-5 to help answer this question.) Figure 13-5 The genetic code The genetic code specifies all possible combinations of the three bases that compose codons in mRNA. Of the 64 possible codons, 61 specify amino acids (see Figure 3-17 for an explanation of abbreviations). The codon AUG specifies the amino acid methionine and also signals the ribosome to initiate translation (start). Three codonsUAA, UGA, and UAGdo not specify amino acids; they terminate polypeptide synthesis (stop).