Hershey and chase Study guides, Class notes & Summaries

IB Biology - Scientists of IB Bio 100% Correct Robert Hooke First person to observe cells and write the cell theory Ernst Ruska Developed the electron microscope in 1930s and won the Nobel Prize for it Friedrich Wohler Urea synthesis which falsified the theory of vitalism Davson-Danielli Proposed the 'protein sandwich' model for membrane structure Louis Pasteur Experiment with broth that confirmed that spontaneous generation of cells and organisms does not occur on Earth ...

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-killing pathogenic strain of bacteria with a living nonpathogenic strain ca...

What does DNA store? - correct answer hereditary information Combining the work of other scientists with their own research, Watson and Crick discovered that two strands of DNA join together to form a(n) __________? - correct answer Double helix What are the two strands of a DNA molecule are held together by? - correct answer Hydrogen bonds An important factor in Oswald Avery's ability to identify the "transforming principle" as DNA was the fact that proteins __________? - cor...

If DNA of a particular species was analyzed and it was found that it contains 21 percent A, what would be the percentage of C? a. 29 b. 21 c. 30 d. 58 - ANSWERS29 The experiments by Hershey and Chase helped confirm that DNA was the hereditary material on the basis of the finding that: a. radioactive phage were found in the pellet b. radioactive cells were in the supernatant c. radioactive sulfure was in the bacterial cell d. radioactive phosphorous was in the bacterial cell - ANS...

Biology 5235 Praxis 2 Latest Update Graded A+ observation the act of noticing and describing events or processes in a careful, orderly way hypothesis scientific explanation for a set of observations that can be tested in ways that support or reject it independent variable variable that is deliberately changed (manipulated variable) dependent variable variable that is observed and that changes in response to the independent variable (responding variable) control group exposed to the same cond...

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...

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...

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 ...

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...

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...