In histones, there are high content of two residues: Lys and Arg, because these residues can a. break DNA double helix O a. O b. O c. O d. O e. interact with the negative ion phosphate of DNA prevent protein and DNA denaturation form hydrogen bonds with sugars break the hydrogen bonds between the base-pairs
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- What is the role of ribosomes in protein synthesis? * A. they carry proteins to the site of action B. they provide a source of amino acids C. they provide a site from tRNAs to link to mRNAs D. they translate the basic DNA code using tRNA Consider the following DNA bases sequence 3' TAT CGG 5'. what dipeptide is formed if a DNA point mutation converts CGG to CGT? * A. Val-Ala B. Asp-Glu C. Ala- Ala D. Gly-Ala A tRNA molecule possesses the anticodon 5' CGU 3' , which amino acid will this tRNA molecule carry? * A. Threonine B. Valine C. Alanine D. Arginine What will most likely be the effect of the change in the DNA molecule? * A. the change will cause a harmful mutation B. the DNA molecule will be unable to replicate…Energy that drives the attachment of a nucleotide to the end of a growing strand of DNA comes from ______. a. phosphate-group transfers from ATP b. DNA polymerase c. the nucleotide itself d. a and cA nucleosome consists of (a) DNA and scaffolding proteins (b) scaffolding proteins and histones (c) DNA and histones (d) DNA, histones, and scaffolding proteins (e) histones only
- All are true for DNA polymerase EXCEPT: / Almal geld vir DNA-polimerase, BEHALWE: A. generates dsDNA from SSDNA / genereer dsDNA vanaf SSDNA B. requires a primer with a free 5'- OH end, but the 3'-end may be phosphorylated / benodig 'n voorvoerder met 'n vrye 5'-OH-groep, maar die 3'-einde kan gefosforileer word. C. copies the sequence of nucleotides of one strand in a complementary fashion. / kopieer die volgorde van nukleotiede van een streng komplementêr. D. synthesizes new strands by adding successive nucleotides in the 5'→3' direction. / sintetiseer nuwe stringe deur opeenvolgende nukleotiede in die 5 '→ 3' rigting toe te voeg. E. copies the sequence of nucleotides of one strand to form a new second strand. / kopieer die volgorde van nukleotiede van eenHistones form more accessible chromatin because of Select one: a. Reduced electrostatic attraction between the histone and the negatively charged DNA backbone b. Increased electrostatic attraction between the histone and the negatively charged DNA backbone c. Reduced covalent bonding between the histone and the negatively charged DNA backbone d. Increased covalent bonding between the histone and the negatively charged DNA backboneWhich repeating sequence below would you expect to find on the end of the longest DNA strand of a chromsome (select one)? A. 5'-TTTTTT-3' B. 5'-TTAGGG-3' C. 5'-CCCTAA-3' D. 5'-AAAAAA-3' E. 5'-GGATCC-3'
- Consider the following segment of DNA:5′ GCTTCCCAA 3′3′ CGAAGGGTT 5′Assume that the top strand is the template strand usedby RNA polymerase.a. Draw the RNA transcribed.b. Label its 5′ and 3′ ends.c. Draw the corresponding amino acid chain.d. Label its amino and carboxyl ends.Repeat parts a through d, assuming the bottom strand tobe the template strand.Histones are a family of positively charged proteins binds tightly with negatively charged, DNA, Histones most likely contains amino acids with R groups of what type? O a. AcidicR group O b. Basic R group O c. Hydrophobic R group O d. Hydrocarbon R group O e. Non-polar R groupA mutant DNA strand was transcribed then translated to proteins. a. What is the protein product of the mutant DNA strand? The sequence of the mutant strand is shown below: 5'-TGCCATAACTGTTCGTACTGGCAAATTGCC-3' 3'-ACGGTATTGACAAGCATGACCGTTTAACGG-5' b. The mutation altered the sequence of the wild type template DNA such that a degenerate codon for a basic amino acid in the wild type was converted to a non-degenerate codon resulting in the sequence for the mutant strand shown. What was the original amino acid? c. Compare the charges and pl of the mutant peptide and the normal (wild- type) peptide at physiological pH?
- 7. The beads on a string in the picture represent what in terms of DNA folding? eir functions. "Beads on a string" 0.05 um 2012 Pearscn Education Inc 300-nm looped domains b. Metaphase chromosome c. pearls d. Individual histones e. nuclosoOmes 8. A particular triplet of bases in the template strand of DNA is 5' ACT 3'. The corresponding codon for the MRNA transcribed is a. either UCA Or TCA, depending on wobble in the first base. b. 3'ACU 5'. c. 5' TCA 3'. d. 3' UGA 5'. e. 3' UCA 5'. LenovoIdentify the sites of lagging strand synthesis. Select all that are true. B A 5 O a. C O b. D O c. A O d. BA small section of a gene for a protein has the following nucleotide sequence:CTG GGA TCC TAA GGTWhich of the following mutations would cause a nonsense mutation in the sequence shown above? Select one: a. Replacement of second adenine base with a cytosine base b. Insertion of guanine base after the first thymine base c. Insertion of guanine base after the first adenine base d. Replacement of second cytosine base with a adenine base
