What is a nucleoid? a structure that is responsible for the production of ribosomes in eukaryotic cells the portion of DNA that is active or "switched on" in the nucleus an artifact that is found in dead eukaryotic cells a special piece of DNA that controls the activities of the nucleus a region in the cytoplasm of bacterial cells where DNA is found
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- oslorGulolaculGACu When does DNA replication occur in the cell cycle? Replicate this strand of DNA: ATTCGC TAG GU Aanine Transcribe the same piece of DNA Stop GU Valine Cystelne Stop Use the chart to create the amino acid sequence. Arginine AC Leucine Sorine C UG Lysine Proline Define gene mutation Asparagine True or False? All mutations are harmful. Define chromosomal mutation. Histidine ThreonineWhy siRNA phenomenon is utilized in cell biology? Because specific gene silencing leads to blocking protein translation Because specific gene silencing leads to blocking mRNA transcription Because specific gene silencing leads to blocking DNA replication All answers are correctEukaryotic mRNA: usessnRNPs to cut out introns and seal together translatableexons. uses a spliceosome mechanism made of DNA to recognizeconsensus sequences to cut and splice. has a guanine cap on its 39 end and a poly(A) tail on its 59 end. is composed of adenine, thymine, guanine, and cytosine. codes the guanine cap and poly(A) tail from the DNAtemplate.
- Figure 29.15 highlights in red the DNA phosphate oxygen atoms. Some of them interact with catabolite activator protein (CAP). What kind of interactions do you suppose predominate, and what kinds of CAP amino acid side chains might be involved in these interactions?Figure 15.16 Many antibiotics inhibit bacterial protein synthesis. For example, tetracycline blocks the A site on the bacterial ribosome, and chloramphenicol blocks peptidyl transfer. What specific effect would you expect each of these antibiotics to have on protein synthesis? Tetracycline would directly affect: tRNA binding to the ribosome ribosome assembly growth of the protein chain Chloramphenicol would directly affect tRNA binding to the ribosome ribosome assembly growth of the protein chainHow many different single-nucleotide substitutions* (changing one nucleotide to another) in the DNA sequence shown below can result in non-sense mutations (a stop codon replaces an amino acid codon) in the second generation in a bacterial strain that is defective in DNA repair? Amino Acids Gln Trp Thr Arg Coding strand: 5'-CAA TGG ACT CGA-3' For your information, Stop codons: TAA, TAG, TGA *Ignore Insertions, and Deletions for this question None of these options 16 4 1 2 O O
- Not all proteins are made from the RNA genome ofbacteriophage MS2 in the same amounts. Can you explainwhy? One of the proteins functions very much like a repressor,but it functions at the translational level. Which protein is itand how does it function?Codons are recognized by O DNA polymerase and a codon FRNA and a codon TRNA and an anticodon MRNA and an anticodon Question 32 The process of transcription produces O MRNA from DNA O protein from DNA O polypeptide from mRNA O DNA from MRNAIove aIung the HRNA from codon to codon, the appropriate amino acids are brought into place and linked together according to the sequence of codons. Thus, the code in the mRNA is translated into a special sequence of amino acids. The order of the amino acids in the protein, therefore, is specified by the MRNA, which in turn is transcribed from the DNA. Procedures and Observations: During transcription, the DNA double helix unwinds and "unzips. The two strands separate as the hydrogen bonds binding the nitrogen bases break. Then, nucleotides present in the cell line up along one strand of the DNA, the order of the nucleotides determined by the order of the nucleotides in the DNA. As the mRNA forms, uracil (U) nucleotides match with adenine (A) nucleotides; cytosine (C) nucleotides match with guanine (G) nucleotides. Note: RNA contains uracil (U) nucleotides where thymine (T) nucleotides would occur in DNA. The nucleotides in the newly formed mRNA are complementary to the nucleotides of…
- DNA replication in bacteria begins at a single origin and proceeds in one direction a single origin and proceeds in both directions two origins and proceeds in both direction many origins and proceed in one direction none of the above . Coupling of transcription and translation is found where? near type II RNA polymerase activity in prokaryotic cells within the eukaryotic nucleus at the ribosomal complex A frameshift mutation has more consequences than point mutation because a frameshift mutation can not ever be transcribed into mRNA molecule prevents uracil from being used in the mRNA molecule only affects a single codon causes all of the codons after it to be different choose the correct number in each questionsPut the steps of protein synthesis in order using this diagram to help you Nudleus DNA Cytoplasm Transcription MRNA Ribosome Amino Acids Translation The MRNA copy of the gene goes from the nucleus to the cytoplasm The ribosome reads the instructions from the MRNA and builds a protein RNA polymerase makes an MRNA copy of a single gene in the DNA DELL F11 PrtSc F7 F8 F9 F10 F4 F5 F6Nucleosomes are: O essential for the correct regulation of eukaryotic gene expression. O All of these answers are correct. O composed of DNA and protein. necessary to package and condense chromosomes.