Hershey and chase Study guides, Class notes & Summaries

Hershey & Chase - Purpose of Each treatment in the Experimental Design - o Research question - Is the genetic material DNA or protein? o Experimental system - Virus (T2 phage) that infects bacteria (E. coli) and re-programs bacteria to make more viruses § Grow virus in a solution containing a radioactive isotope - 35S and 32P § Infect E. coli with radiolabeled virus § Remove virus from E. coli cells § Centrifuge growth solution so E. coli sinks to bottom of tube § Virus coats rema...

Bio 150 Final Exam - UTK Mamantov(2024 LatestWhat statement best distinguishes scientific hypotheses from scientific theories? - ANSWER Hypotheses are usually narrower in scope; theories have broader explanatory power. A controlled experiment ____________. - ANSWER includes at least two groups, one of which does not receive the experimental treatment In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which fact? - ANSWER DNA contains phosph...

What is the reason that closely linked genes are typically inherited together? - ANSWER the likelihood of a crossover event between these two genes is low All female mammals have one active X chromosome per cell instead of two. What causes this? - ANSWER activation of the XIST gene on the X chromosome that will become the Barr body In his transformation experiments, what did Griffith observe? - ANSWER Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can...

Hershey & Chase experiment Experiment target: T2 Bacteriophage (a kind of virus, containing DNA and a protein coat) & E.Coli bacteria How does virus work? • Virus injects their genetic material into cell • Non-genetic part of the virus (protein coat) remains outside the cell • Infected cell produces large amount of viruses based on the genetic material in the cell • The cell bursts releasing copied viruses Experimental methodology: • Amino acid containing radioactive isotopes ...

Friedrich Miescher - discovered DNA in 1869 But did not know (Isolated phosphate) rich acidic compounds Frederick Griffith - Discovered transformation during an experiment that involved injecting mice with smooth S cells, rough R cells, heat-killed S cells, and heat-killed S cells with living R cells. Avery, MacLeod, McCarty - Identified the heritable substance as DNA Used test tubes- vitro Hershey and Chase - performed experiments showing that DNA is the genetic material of a phage known...

Biology ABCTE Certification Test Part 1genetic drift - correct answer The following phenomena affect Hardy-Weinberg equilibrium. Which one is associated with small populations and chance changes in allele frequency? allantois - correct answer Which embryonic membrane develops into the umbilical cord in placental mammals? separation of homologous chromosomes during meiosis - correct answer Mendel observed that pea color was a characteristic passed independently of flower color. What caus...

Bio 150 Final Exam Study Guide Accurate 100Anton van Leeuwenhoek - ANSWER Linen merchant that discovered the first microscope and saw living cells Oswald Avery - ANSWER Worked with strains of Pneumonia to determine genetic changes Robert Koch - ANSWER Correlated specific microbes with infections Gregor Mendel - ANSWER Worked with pea plants to show heredity patterns Carolus Linnaeus - ANSWER Zoologist that created the current naming system Alfred Hershey and Martha Chase - ANSWER ...

Biology 1406 exam 5 questions and answers already passed In 1928, __________ was surprised to find that when he killed pathogenic bacteria, then mixed the bacterial remains with living harmless bacteria, some living bacterial cells became pathogenic. Frederick Griffith In 1952, ___________ used bacteriophages to show that DNA is the genetic material of T2, a virus that infects the bacterium Escherichia coli (E. coli). Hershey-Chase __________ are viruses that infect bacterial c...

In an analysis of the nucleotide composition of a double stranded DNA molecule, which of the following will not be found? A. C = G B. C + G = A + T C. A/T = C/G D. A - C = T - G - ANSWER B. C + G = A + T A controlled experiment.... A. Includes at least two groups, one of which does not receive the experimental treatment. B. Proceeds at a slow pace to guarantee that the scientist can carefully observe all results. C. Includes at least two groups, one different from the other by two or m...

In the 1944 experiment by Avery et al., only ___ was able to transform a nonvirulent strain of bacteria into a virulent one, thereby demonstration that it is likely the ___. A) protein; chromosomal material B) genetics; protein material C) amino acid; DNA material D) DNA; genetic material D) DNA; genetic material Hershey and Chase (1952) blender experiment demonstrated that A) protein is not required for virus production B) viral coat proteins can enter the infected bacterial cells C) ...