You are watching: Which of the following statements about dna structure is true
Which statement is true?-G-C base pairs have three hydrogen bonds while A-T base pairs have two hydrogen bonds.-A-T base pairs have three hydrogen bonds while G-C base pairs have two hydrogen bonds.
True. Guanine and adenine are indeed purines found in DNA; thymine and cytosine are the pyrimidines found in DNA.
Which of the following statements about DNA structure is true?-The nucleic acid strands in a DNA molecule are oriented antiparallel to each other, meaning they run in opposite directions.-The pentose sugar in DNA is ribose.-Hydrogen bonds formed between the sugar‑phosphate backbones of the two DNA chains help to stabilize DNA structure.-Nucleic acids are formed through phosphodiester bonds that link nucleosides together.
The nucleic acid strands in a DNA molecule are oriented antiparallel to each other, meaning they run in opposite directions. This statement is true; the 5′-3′ orientation of each chain runs in opposite directions.
The classic Hershey and Chase (1952) experiment that offered evidence in support of DNA being the genetic material in bacteriophages made use of which of the following labeled component(s)?
The Hershey and Chase experiments involved the preparation of two different types of radioactively labeled phage. Which of the following best explains why two preparations were required?-Establishing the identity of the genetic material required observation of two phage generations.-The bacteriophage used in the experiments was a T2 phage.-It was necessary that each of the two phage components, DNA and protein, be identifiable upon recovery at the end of the experiment.-Each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope.
It was necessary that each of the two phage components, DNA and protein, be identifiable upon recovery at the end of the experiment. Because it was concluded that the component associated with bacteria at the end of the experiment must be the genetic material, it was critical that the component be identifiable as either DNA or protein.
Which of the following statements best represents the central conclusion of the Hershey-Chase experiments?-Phage T2 is capable of replicating within a bacterial host.-DNA is the identity of the hereditary material in phage T2.-When radioactive sulfur is supplied in a growth medium, it is primarily DNA that incorporates radioactive label.-Some viruses can infect bacteria.
DNA is the identity of the hereditary material in phage T2. Because phage DNA and not protein was associated with bacteria at the end of the experiment, it could be concluded that DNA - not protein - must be the genetic material.
Which of the following outcomes would be most likely if the Hershey-Chase experiments were repeated without the step involving the blender?-Both preparations of infected bacteria would contain both P32 and S35.-Both preparations of infected bacteria would exhibit radioactivity.-The phage would fail to infect bacteria.-Neither preparation of infected bacteria would exhibit radioactivity.
Both preparations of infected bacteria would exhibit radioactivity. Instead of being removed from the preparation, the "ghosts" would be retained. Because both bacterial preparations would include ghosts as well as viral DNA, both would be radioactive, one with P32, one with S35.
In an analysis of the nucleotide composition of double-stranded DNA to see which bases are equivalent in concentration, which of the following would be true?-A + C = G + T-A + T = G + C-A = C-A = G and C = T-A = G and C = T and A + C = G + T are both true.
The processing of genetic information that results in synthesis of proteins which contribute to the phenotype of the organism.
The genetic material must be stable enough to maintain information in __________ from one cell to the next and one organism to the next.
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Reverse transcriptase is an enzyme found in association with retroviral activity. It has the property of ________.
