- Which of the following best describes the views on free trade within the Republican Party?
- Those of which ideology tend to prefer more immigrant work visas?
- About how many immigrant work visas are given per year?
- Those of which ideology tend to oppose increasing taxes on the super wealthy?
- A characteristic shared by eukaryotic mRNA, tRNA, and ribosomal RNA is that... they are all synthesized in the cytoplasm they all encode proteins they are all transcribed from DNA none of them encode proteins all are associated with the endoplasmic reticulum
- A. The molecule that carries information from the DNA specifying a polypeptide to ribosomes. B. The synthesis of an RNA copy of a gene.C. The synthesis of a specific sequence of amino acids on a ribosome. D. A molecule found in the nucleus of cell that contains the cell's genome. E. A molecule made of amino acids that correspond to the genetic information in a structural gene.
- Where does the greatest variability among codons specifying the same amino acid occur? in the third nucleotide of the triplet in the first and third nucleotides of the triplet in the first two nucleotides of the triplet in the last two nucleotides of the triplet in the middle nucleotide of the triplet
- The reason that the genetic code can correctly specify the order of amino acids in a polypeptide is ribosomes add amino acids to the right tRNAs. the ribosome recognizes codons and directly attaches amino acids. mRNAs form a shape that allows attachment of the right amino acid. amino acids are covalently joined to the codons in an mRNA. specific tRNAs become attached to specific amino acids.
- The genetic code consists of ____ codons that specify amino acids, and ____ codons that do not specify amino acids. 21/3 64/3 20/3 61/3 60/4
- In eukaryotes, transcription to produce an mRNA must occur in the nucleus, where the chromosomal DNA is found. the endoplasmic reticulum, where there are bound ribosomes. vesicles, which contain enzymes for RNA breakdown. Either in the cytoplasm or on the endoplasmic reticulum, where ribosomes are present. the cytoplasm, where free ribosomes are found.
- Total nucleic acids are extracted from a culture of cells and are then mixed with resin beads to which the polynucleotide 5'-TTTTTTTTTTTTTTTTTTTTTT-3' has been covalently attached. After a short incubation, the beads are then extracted from the mixture. When you analyze the cellular nucleic acids that have stuck to the beads, which of the following molecules do you expect to be most abundant? pre mRNA transcript DNA mRNA tRNA rRNA
- Shortly after RNA polymerase begins to transcribe a pre-mRNA, a _________ is added.In the nucleus, both 5' and 3' modifications to mRNA are important for ______________.In the cytosol, the 5' cap is recognized by proteins that enable the mRNA to be ___________.A mature mRNA will have a __________ added.In the cytosol, the poly A tail is important for _________ of the mRNA.
- During the process of transcription in a eukaryote DNA polymerase must first unwind the DNA duplex. RNA is copied into DNA by a large enzyme. genes are exported to the cytoplasm. RNA polymerase synthesizes new nucleotide chains in the 5' to 3' direction. ribosomes are recruited to the endoplasmic reticulum (ER).
- Of which type of molecules are spliceosomes composed? DNA and protein RNA RNA and protein DNA Protein
- During the replication of a DNA molecule the two strands in a parental molecule remain paired with each other. the two new products of replication will have different genetic information. new base pairs must be formed according to Chargaff's rule. new base pairs arise by the formation of covalent bonds between the bases. A will be paired with G, and T will be paired with C.
- There is only one codon, 5'-UGG-3', for the amino acid tryptophan (trp), therefore the anticodon in the tRNA for tryptophan must have the sequence _________.A tRNA with anticodon 3'-GGG'-5' would be attached to the amino acid ________.A tRNA with anticodon 3'-UAC-5' would be attached to the amino acid _____________.The amino terminus of a polypeptide will contain amino acids whose codons are closer to the _______ end of the mRNA.The carboxyl terminus of a polypeptide will contain amino acids whose codons are closer to the _____ end of the mRNA.Part of a gene sequence on the DNA reads 5'-ATGCGC-3'. The mRNA will therefore read __________ in that region.The template strand of a gene includes the sequence 3'-AGT-5'. The mRNA will therefore have the sequence ________ in the same position.
- There is only one start codon, AUG. This means that all newly-made polypeptides have a methionine at their carboxyl end. the first tRNA will have the anticodon loop 3'-AUG-5'. all newly-made polypeptides have a methionine at their amino end. the stop codons each have their own special tRNAs. the 5' end of an mRNA must start with an A.
- Which of the following does not occur during the processing of eukaryotic mRNA? a 5' guanosine cap is added. a ribosome recognition sequence is added. introns are removed by splicing. several adenine (A) residues are added at the 3' end.
- How does a bacterial ribosome initially bind to the mRNA? The small subunit binds to the 5' guanine cap The small subunit binds to the initiator tRNA, which recognizes and binds to the start codon in the mRNA The small subunit binds directly to the start codon The small subunit binds to ribosomal binding sequence The large subunit binds to the initiator tRNA, which recognizes and binds to the start codon in the mRNA
- A difference between bacterial and eukaryotic translation is a 5' cap is added to the mRNA before translation only in bacteria bacteria use a completely different genetic code than eukaryotes. modifications to the 5' end of mRNA help it to bind to ribosomes only in eukaryotes special tRNAs read the stop codons only in in eukaryotes translation can begin on an mRNA still being synthesized only in eukaryotes.