Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 2, Problem 2.8PS
QUANTITATIVE Bond Energies. A single covalent bond has a bond energy of approximately 90 kcal/mol, and a typical hydrogen bond has a bond energy of about 5 kcal/mol. Although weak, hydrogen bonds can be a major structural force when present in large numbers as in DNA. In double-stranded DNA, each AT base pair is held together by two hydrogen bonds, and each GC base pair is held together by three hydrogen bonds.
(a) What is the total bond energy in a propane molecule (see Figure 2-4)? The C—C bond energy is 83 kcal/mol, and the C—H bond energy is 99 kcal/mol.
(b) In a short 15 base-pair molecule of DNA having 60% GC pairs and 40% AT pairs, what is the total bond energy of all the hydrogen bonds? How does this compare to the bond energy of a carbon-carbon bond?
(c) In a typical gene consisting of 1000 base pairs with the same relative GC versus AT content, what is the total bond energy of all the hydrogen bonds? How does this compare to the bond energy of a carbon-carbon bond?
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Alleles at the P locus control seed color. Plants which are pp have white seeds, white flowers and no pigment in vegetative parts. Plants which are P_ have black seeds, purple flowers and may have varying degrees of pigment on stems and leaves. Seed color can be assessed, visually, based on if the seed is white or not white
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A gene for mold resistance has been reported and we want to determine its inheritance and whether it is linked to P. For the purposes of this exercise, we will assume that resistance is controlled by a single locus M, and M_ plants are resistant and mm plants are susceptible. Resistance can be measured, under greenhouse conditions, 2 weeks after planting, by injecting each seedling with a spore suspension. After two weeks, the seedlings can be rated as resistant or susceptible, based on whether or not tissue is actively sporulating.
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Chapter 2 Solutions
Becker's World of the Cell (9th Edition)
Ch. 2 - What properties of the carbon atom make it...Ch. 2 - QUESTION: Compare the flights of the ionized...Ch. 2 - How would the properties of water change if the...Ch. 2 - Why is the amphipathic nature of membrane...Ch. 2 - Problem Set CONCEPT CHECK 2.4 What characteristics...Ch. 2 - Problem Set CONCEPT CHECK 2.5 TMV is an...Ch. 2 - The Fitness of Carbon. Each of the properties that...Ch. 2 - The Fitness of Water. For each of these statements...Ch. 2 - Wrong Again. For each of the following false...Ch. 2 - Prob. 2.4PS
Ch. 2 - Drug Targeting. Your company has developed a new...Ch. 2 - Its All About Membranes. Answer each of the...Ch. 2 - The Polarity of Water. Defend the assertion that...Ch. 2 - QUANTITATIVE Bond Energies. A single covalent bond...Ch. 2 - TMV Assembly. Each of these statements is an...Ch. 2 - Mars Is Alive? Imagine this futuristic scenario:...
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