Bio 219-exam 2 review DHL Revision Question And Answers Correctly Solved.

Which of these can be detected for signaling? A. Heat B. light C. Molecules D. Any of these can be detected if the right receptor is present - correct answer D Which of these is true about ligand/receptor interactions? A. Each receptor can bind many kinds of ligands B. Each ligand can bind many kinds of receptors C. Ligand/receptor interactions are highly specific due to binding affinity D. The outcome of the ligand/receptor binding is always the same - correct answer C Which of these nucleotides is used for allosteric changes in signaling pathways? A. ATP B. GTP C. TTP D. CTP - correct answer B Which of these nucleotides is used for chemically changes a molecule by adding or removing phosphates? A. ATP B. GTP C. TTP D. CTP - correct answer A True or false: Every cell of your personal organism has the same genome (at least 99.999% identical) - correct answer True True or false: The entire genome codes for protein products - correct answer False Which of these molecules is the "recipe" for protein production? A. DNA B. RNA C. Protein D. Lipids - correct answer B Which of these is an exception to the "one gene, one enzyme" hypothesis? A. not all proteins are enzymes B. Not all RNAs code for proteins C. Sometimes RNAs are alternatively spliced, so one gene could code for slightly different proteins D. All of these are possible - correct answer D Where are the covalent bonds in DNA? A. between bases of 2 different strands B. between hydroxyls and phosphates of 2 different nucleotides - correct answer B True or false: purine bases always pair with pyrimidine bases in DNA - correct answer true Which of these best describes a nucleosome? A. 8 proteins ionically interacting with 150bp of DNA B. 4 proteins ionically interacting with 150bp of DNA C. 8 proteins covalently bonding with 150bp of DNA D. 8 proteins ionically bonding with 75bp of DNA - correct answer A RNA is produced by which of the following? A. transcription B. translation C. replication - correct answer A Where does transcription begin? A. 5' of coding strand B. 3' of coding strand C. 3' of template strand D. 5' of template strand - correct answer C Which of these is NOT a feature of RNA polymerase? A. DNA entry site B. DNA exit site C. RNA entry site D. RNA exit site - correct answer C Which of these polymerases makes mRNA in eukaryotes? A. RNA polymerase I B. RNA polymerase II C. RNA polymerase III D. DNA polymerase - correct answer B Where does RNA processing occur? A. nucleus B. nuclear pore C. cytoplasm D. Depends on where it is used - correct answer A When does RNA processing occur? A. before transcription B. During transcription C. After transcription, but before nuclear export D. After transcription and after nuclear export - correct answer B Which of these can be added in the nucleus AND the cytoplasm? A. polyA tail B. Any random 3 nucleotides C. a 7mG in a 5'-3' link D. a 7mG in a 5'-5' link - correct answer A Which of these is FALSE about splicing? A. The 2'OH of the intron attacks the 5' end of the intron B. The 3'OH of the first exon attacks the 3' end of the intron C. The introns are spliced by the spliceosome D. The proteins of the spliceosome are catalytic - correct answer D True of false: all ribosomes start out free - correct answer true Which of these would you find on a protein to be secreted, but not a protein that is functional in the cytoplasm? A. An amino acid signature that can be bound by importin (NLS) B. An amino acid signature that can be bound by exportin (NES) C. An amino acid signature that can be bound by SRP - correct answer C When are membrane proteins inserted into a membrane? A. During translation on a free ribosome B. After translation when they enter a vesicle C. During translation at the ER D. After translation they can be inserted into a membrane - correct answer C Which of these is NOT a function of the ER? A. N-linked glycosylation B. Quality control checks C. Binding to exportin D. Sensing misfolded proteins to signal problems to the cell - correct answer C Which of these provides the "zip codes" that localize proteins in the endomembrane system? A. N-linked glycosylation in the ER B. O-linked glycosylation in the golgi