Modified Mastering Biology With Pearson Etext -- Standalone Access Card -- For Biological Science (7th Edition)
Modified Mastering Biology With Pearson Etext -- Standalone Access Card -- For Biological Science (7th Edition)
7th Edition
ISBN: 9780135276556
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 4, Problem 12PIAT
Summary Introduction

To analyze:

The orientation of the sugar–phosphate backbone in Pauling’s model compared with the one proposed by Watson and Crick to analyze whether Pauling’s structure could exist in cells or not with explanation.

Introduction:

The structure of DNA followed today was earlier published incorrect by researchers Linus Pauling and Robert Corey in 1953 due to insufficient data and an overloaded research schedule. This model proposed that DNA has triple-stranded structure with the nitrogenous bases on the exterior and the sugar-phosphate backbones clustered in the middle. In the 1950s, the race to solve the secondary structure of DNA became intense. In an uncharacteristic rush to publish, Linus Pauling erroneously proposed a triple-stranded structure in February 1953. This model had the nitrogenous bases on the exterior and the sugar–phosphate backbones clustered in the middle.

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After you feel comfortable with your counting method and identifying cells in the various stages of mitosis, use the four images below of whitefish blastula to count the cells in each stage until you reach 100 total cells, recording your data below in Data Table 1. (You may not need to use all four images. Stop counting when you reach 100 total cells.) After totaling the cells in each stage, calculate the percent of cells in each stage. (Divide total of stage by overall total of 100 and then multiply by 100 to obtain percentage.)   Data Table 1Stage    Totals    PercentInterphase        Mitosis:        Prophase        Metaphase        Anaphase        Telophase        Cytokinesis        Totals    100    100% To find the length of time whitefish blastula cells spend in each stage, multiply the percent (recorded as a decimal, in other words take the percent number and divide by 100) by 24 hours. (Example: If percent is 20%, then Time in Hours = .2 * 24 = 4.8) Record your data in Data…
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