Meselson and Stahl cultured E. Coli for several generations in a medium with a hefty isotope the nitrogen, 15N. They moved the bacteria come a medium with a light isotope that nitrogen, 14 N. After 2 rounds the DNA replication, fifty percent the DNA molecules to be light (both strands had actually 14N) and fifty percent were hybrids (15N-14N). What go the researchers conclude from this results?A opposite DNA strands room complementary to each other.B The nitrogenous bases in DNA molecule incorporate both 15N and 14N.C DNA replication is semiconservative
DNA is a self-replicating molecule. What accounts because that this important property that DNA?A Its 2 strands are hosted together by easily damaged covalent bonds.B Replication is thermodynamically spontaneous and also requires no enzymes.C The nitrogenous bases that the double helix are paired in specific combinations: A through T and also G through C.

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Nucleotides are included to a growing DNA strand together nucleoside triphosphates. What is the meaning of this fact?A Nucleoside triphosphates are much more abundant in the cell than nucleotides. B Hydrolysis that the two phosphate teams (P-Pi) and also DNA polymerization room a combination exergonic reaction. C Nucleoside triphosphates are more easily transported in the cell than room nucleotides.
During DNA replication, the leading strand is synthesized continuously, whereas the lagging strand is synthesized as Okazaki fragments. Why is this so?A DNA polymerases have the right to bind to only one strand in ~ a time.B DNA synthesis can take place only in the 5\" come 3\" direction.C There space thousands of origins of replication top top the lagging strand however only one ~ above the top strand.
Select the many accurate declare describing DNA replication complexes.A DNA and the DNA replication complexes right together favor a lock and also key.B DNA replication complexes room grouped into factories, which room anchored come the atom matrix.C DNA replication complexes relocate along a DNA railway track.
Which of this is a difference in between a DNA and also an RNA molecule?ADNA is commonly double-stranded, conversely, RNA is normally single-stranded. B DNA includes uracil, whereas RNA has thymine. C DNA is a polymer written of nucleotides, vice versa, RNA is a polymer written of main point acids. D DNA has five-carbon sugars, vice versa, RNA consists of six-carbon sugars. E DNA includes nitrogenous bases, vice versa, RNA contains phosphate groups.
Which of this nitrogenous bases is found in DNA but not in RNA?A cytosine B uracil C adenine D guanine E thymine
Nucleic acids space assembled in the _____ direction. A 4\" come 5\" B 5\" come 3\" C 1\" come 5\" D 2\" to 3\" E 5\" to 1\"
In a DNA twin helix an adenin of one strand always pairs through a(n) _____ of the complementary strand, and also a guanine that one strand always pairs through a(n) _____ that the security strand. A uracil ... Cytosine B cytosine ... Uracil C cytosine ... Thymine D thymine ... Cytosine E guanine ... Adenine
Short segments of freshly synthesized DNA are joined right into a constant strand by _____. A helicase B DNA polymerase C single-strand binding protein D primase E ligase
After DNA replication is completed, _____. A each brand-new DNA double helix is composed of one old DNA strand and one new DNA strand B each brand-new DNA twin helix consists of two new strands C every of the 4 DNA strands consists of part old strand parts and also some brand-new strand parts there are four dual helices D one DNA dual helix consists of two old strands and also one DNA twin helix is composed of two brand-new strands
The activity of helicase create _____. A DNA fragments and also replication bubbles B primers and also replication balloon C DNA fragments and replication forks D primers and DNA pieces E replication forks and also replication bubbles
Why is the brand-new DNA strand complementary come the 3\" to 5\" strands assembled in quick segments? A DNA polymerase have the right to assemble DNA only in the 3\" to 5\" direction B the replication forks block the formation of much longer strands C only quick DNA assignment can expand off the RNA primers D that is more efficient than assembling complete new strands E DNA polymerase have the right to assemble DNA only in the 5\" come 3\" direction
An old DNA strand is used as a _____ for the assembly the a brand-new DNA strand. A resource of nucleotides B inside wall C model D layout E complement
The first step in the replication of DNA is catalyzed by _____. A helicase B ligase C single-strand binding protein D DNA polymerase E primase
Suppose friend are listed with an proactively dividing culture of E. Coli bacteria come which radioactive thymine has been added. What would take place if a cabinet replicates when in the existence of this radioactive base? A neither of the two daughter cells would certainly be radioactive. One of the daughter cells, yet not the other, would have radioactive DNA. B radioactive thymine would pair through nonradioactive guanine. C DNA in both daughter cells would be radioactive. D All 4 bases the the DNA would certainly be radioactive.

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The DNA the telomeres has actually been found to be highly conserved transparent the evolution of eukaryotes. What go this most more than likely reflect? A the short frequency that mutations arising in this DNA B the inactivity of this DNA C that mutations in telomeres are relatively advantageous D the the an important function of telomeres have to be maintained that new evolution the telomeres continues
It became evident to Watson and Crick after perfect of their model that the DNA molecule could lug a substantial amount of hereditary info in i beg your pardon of the following? A sequence of bases B phosphate-sugar backbones C different five-carbon sugars D safety pairing of bases E side groups of nitrogenous bases
What is meant by the summary \"antiparallel\" concerning the strands that comprise DNA? A One strand is positive charged and the other is negatively charged. B basic pairings develop unequal spacing in between the 2 DNA strands. C The twisting nature of DNA create nonparallel strands. D One strand consists of only purines and also the other has only pyrimidines. E The 5\" to 3\" direction that one strand runs respond to to the 5\" come 3\" direction of the various other strand.
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