BIOL Chapter 11 Review Practice Study Exam Questions A Graded.

BIOL Chapter 11 Review Practice Study Exam Questions A Graded. Griffiths (1928) mixed heat-killed 'S' bacteria with 'R' bacteria and injected a mouse with both types of bacteria. As a result, the mouse died and Griffiths obtained living 'S' bacteria from the dead mouse. How can you explain this phenomenon? The DNA from the 'S' bacteria with the gene responsible for capsule formation was transferred to the 'R' bacteria when the strains were mixed. This gene transformed the 'R' bacteria into 'S' bacteria, allowing it to produce a capsule and evade the mouse's immune system. Why were Griffiths' 'S' strains able to produce a polysaccharide coat while the 'R' strains could not? The 'S' and 'R' strains carry differences in their genetic material. Brainpower Read More Match the experimental procedures and findings with the correct scientific investigators. Match the experimental procedures and findings with the correct scientific investigators. Wilkins and Franklin (1953) - X-ray diffraction of DNA showed it was a helix - Determined that DNA had a repeating structure and a uniform diameter Watson and Crick (1953) - Used the biochemical modeling approach of Pauling - Built models of DNA structure Chargaff (1950) - Measured A, C, T, G in different species, found A=T, C=G Identify the components of DNA by dragging and dropping the labels to the correct locations ... Identify the components of DNA by dragging and dropping the labels to the correct locations on the figure. The pairing of nitrogenous bases in DNA is specific because functional groups on each of the bases form hydrogen bonds with functional groups on only one other base. Complete the sentences about the process of DNA replication with the correct terms. When replication starts, an origin of replication forms, consisting of two replication fork(s) moving in opposite directions. DNA double helix is separated into single strands by the enzyme DNA helicase. Newly-exposed, unreplicated DNA is protected by single-strand binding protein. Short segments of RNA are synthesized, called RNA primers. The enzyme that synthesizes the short segments of RNA is called a primase. The short RNA segments provide a free 3' OH for replication. New DNA is synthesized in the 5' to 3' direction. The enzyme that removes tightened coils ahead of the replication fork is topoisomerase. The enzyme that catalyzes new DNA synthesis is DNA polymerase. DNA synthesis occurs continuously on the leading strand. DNA synthesis occurs in small sections on the lagging strand. Fragments of discontinuous DNA synthesis are called Okazaki fragments. Gaps in the sugar-phosphate backbone of DNA are closed by DNA ligase. Suppose actively dividing eukaryotic cells were treated with a chemical that blocks the activity of the enzyme telomerase. What would happen to these cells?