Hershey chase Study guides, Class notes & Summaries

What is the structure of DNA? CORRECT ANSWER Molecules called nucleotides, each nucleotide has a phosphate group, sugar group, and a nitrogen base. Its made up of 2 strands forming a double helix Role of Alfred Hershey and Martha Chase in discovering the structure of DNA CORRECT ANSWER -Alfred Hershey and Martha chase performed experiments showing that DNA is the genetic material of a phage known as T2 -They designed an experiment showing only 2 components of T2 (DNA or protein) enters an E....

GCD Group Problems Test with Complete Solutions 1. From their experiments, Hershey and Chase concluded that the genetic material of T2 is DNA. Were there data consistent with the genetic material being RNA? If so, how could they have experimentally distinguished between DNA and RNA as the genetic material? You can assume that they had all types of radiolabeled bases (A, T, G, C and U) at their disposal. - Answer-Hershey and Chase used 32P, a radioisotope of phosphorus, to label DNA in T2 Phag...

genetic material must meet what criteria ANSWER: -information -replication -transmission -variation what happened in the late 1800s ANSWER: -biochemical basis -chromosomes carry genetic information what happened in the 1920s to 1940s ANSWER: -protein portion of chromosomes to be the genetic material explain Griffith's bacterial transformation ANSWER: -late 1920s Frederick griffith - streptococcus pneumoniae - staring that secrete capsules look smooth (fatal in mice) Deeagles - S...

Proteins- four things they do correct answers -building blocks for cell structures - form enzymes that catalyze chem reactions - regulate the activity of genes - enable cell to move and communicate junk dna correct answers dna that encodes for information not needed in the cell When can chromosomes be seen clearly correct answers during cell division Cell Division is the most.....need what? correct answers ...important bio. process, but you need a blueprint for daughter cells (inheri...

What cellular events occur in the G1 phase of the cell division cycle? - ANSWER normal growth and cell function What is the best way to describe homologous chromosomes? - ANSWER they carry information for the same traits In some parts of Africa, the frequency of individuals who are heterozygous for the sickle-cell anemia allele is higher than the frequency in North America, presumably because this reduces the frequency of malaria. Such a relationship is related to what? - ANSWER Darwin's ...

What cellular events occur in the G1 phase of the cell division cycle? - normal growth and cell function What is the best way to describe homologous chromosomes? - they carry information for the same traits In some parts of Africa, the frequency of individuals who are heterozygous for the sickle-cell anemia allele is higher than the frequency in North America, presumably because this reduces the frequency of malaria. Such a relationship is related to what? - Darwin's theory of natural sel...

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...

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 ...

BIO 111 TAMU Fletcher Exam 3 Questions and Answers 100% Solved 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 e...

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...