BIO test 3/1/22

What is an adaptive advantage of recombination between linked genes?
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What is an adaptive advantage of recombination between linked genes?
New allele combinations are acted upon by natural selection.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work?
Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
In E. coli, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin. Which of the following would you expect as a result of this mutation?
No replication fork will be formed
Eukaryotic telomers replicate differently in chromosomes, this is a consequence of which of the following?
gaps left at the 5' end of the lagging strand
The difference between ATP and the nucleotide triphosphate is
The nucleoside triphosphates have two phosphate groups; ATP has three phosphate groups.
Lagging strands
new strands of DNA that form in discontinuous segments away from the fork
Within a double stranded Dna molecule adenine forms ..... This arrangment____
Within a double-stranded DNA molecule, adenine forms hydrogen bonds with thymine, and cytosine forms hydrogen bonds with guanine.
DNA contains the template needed to copy itself, but it has no catalytic activity in cells. What catalyzes the formation of phosphodiester bonds between adjacent nucleotides in the DNA polymer being formed?
DNA polymerase
What provides the enegry for the polymerizarion reaction in DNA Synthesis
The energy for this process of DNA polymerization comes from hydrolysis of the high-energy phosphate (phosphoanhydride) bonds between the three phosphates attached to each unincorporated base.
3' prime end of the primer
Dna polymerase can only add to this end
What is the different between the leading strand and the lagging strand in DNA replication? (Okazki fragments)The main difference between leading and lagging strand is that the leading strand is the DNA strand, which grows continuously during DNA replication whereas lagging strand is the DNA strand, which grows discontinuously by forming short segments known as Okazaki fragments.Researchers found a strain of E. coli bacteria that had mutation rates one hundred times higher than normal. Which of the following statements correctly describes the most likely cause of these results?The proofreading mechanism of DNA polymerase was not working properly.What amino acids sequence will be generated based on mRNA codon Sequence (5'AUGUCUUCGUUAUCCUUG3')?met-ser-ser-leu-ser-leuWhat is anti codon for tRNA that transports phenylalanine to ribosomes ?UUA or UUGAAA or AAGWhat is the mechanism of information transferred in eukaruots?mainly because acquired DNA must pass through both the outer cell membrane and the nuclear membrane to reach the eukaryote's genome.Significance of TATA box in eurkayotic promoters... WHich of the following based describes the significance of TATA boxin euakaryoitc prompoters?It is the recognition site for a specific transcription factor.Functional mRNA size comparison between Prokarytoic cells and eukaryotic cells?prokaryotic mRNA is polycistronic, whereas eukaryotic mRNA is monocistronic.A nonsense mutation in a gene__introduces a premature stop codon into the mRNAWhich of the following DNA muatuons is most likely to damage the protein it specifies?a base-pair deletionA single base substitution is least likely to be deletartious when the base change result in ___.a codon that specifies the same amino acid as the original codonDuring meiosis, a defect occurs in a cell that results in the failure of microtubules, spindle fibers, to bind at the kinetochores, a protein structure on chromatids where the spindle fibers attach during cell division to pullsister chromatids apart. Which of the following is the most likely result of such a defect?The resulting cells will not receive the correct number of chromosomes in the gametes, a condition known as aneuploidy.Chromosome number if separation failsIf the chromosomes don't split into equal halves, the new cells can have an extra chromosome (47 total) or have a missing chromosome (45 total).What would of happened in Herhsy- chase expiriment if rNA virus was used instead of dNA virus?The results would be the same.A mutation occurs that changes the gene sequence (3'TACTAGGCTAGTTGA5' to (3'TACTAGACT5'___ how does this effect the amino acid sequence? (Start and stop codons)no clue lol