CAMPBELL BIOLOGY,VOL.II >CUSTOM<
17th Edition
ISBN: 9781323803677
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 16, Problem 10TYU
EVOLUTION CONNECTION Some bacteria may be able to respond to environmental stress by increasjng the rate at which mutations occur during cell division. How might this be accomplished? Might there be an evolutionary advantage to this ability? Explain.
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. While perusing the E. coli K12 genome sequence,you come across a gene with no known function. Theamino acid sequence of the gene’s protein productshows weak similarities with known porins, proteinsthat cross a cellular membrane to let molecules suchas amino acid or sugar nutrients (or drugs like penicillin) pass through. Some porins are nonspecific and letany solute up to a certain size transit into the cell.Other porins are specific and allow the transit ofcertain sugars but not others. What genetic experiments could you do to try to determine whether thisnew gene has a specific function in allowing bacterialcells to scavenge the sugar maltose from the environment? Describe scenarios that might complicate yourexperimental approach.
Experiment:
In this activity yo Page 5
ze the results of experiments that investigate nutritional requirement of
several mutant strains of yeast. The mutations in these strains cause a nutritional requirement for an
amino acid, such that the strains will not grow in media that lack one specific amino acid. Any mutant
that has a nutritional requirement is called an auxotroph, and is incapable of growing in a "minimal
medium" containing only a carbon source (e.g., glucose), a simple nitrogen source (e.g., ammonium
sulfate), and various salts and minerals. Such strains can be supported on a medium supplemented
with only the missing nutrient or on a "rich" medium that contains amino acids, vitamins, nitrogenous
bases, etc. (often in the form of an extract from yeast). The wild-type individual that can synthesize
the metabolic component is a prototroph, and is capable of growth on minimal medium.
The mutant strains in this activity are unable to synthesize tryptophan, lysine, or histidine;…
Explain why they qualify as machines based on their functions and component molecules.
Chapter 16 Solutions
CAMPBELL BIOLOGY,VOL.II >CUSTOM<
Ch. 16.1 - Given a polynucleotide sequence such as GAATTC,...Ch. 16.1 - VISUAL SKILLS Griffith was trying to develop a...Ch. 16.2 - What role does complementary base pairing play in...Ch. 16.2 - Identify two major functions of DNA pol III in DNA...Ch. 16.2 - Prob. 3CCCh. 16.2 - Prob. 4CCCh. 16.3 - Describe the structure of a nucleosome, the basic...Ch. 16.3 - What two properties, one structural and one...Ch. 16.3 - MAKE CONNECTIONS Interphase chromosomes appear to...Ch. 16 - What does it mean wheti we say that the two DNA...
Ch. 16 - DRAW IT Redraw the Punnett Square on The right...Ch. 16 - Describe the levels of chromatin packing you'd...Ch. 16 - In his work with pneumonia-causing bacteria and...Ch. 16 - What is the basis for tlie difference in how the...Ch. 16 - In analyzing the number of different bases in a...Ch. 16 - The elongation of the leading Strand during DNA...Ch. 16 - In a nucleosome, the DNA is wrapped around (A)...Ch. 16 - E. coli cells grown on, 15N medium are transferred...Ch. 16 - A biochemist isolates, purifies, and combines in a...Ch. 16 - The spontaneous loss of amino groups from adenine...Ch. 16 - MAKE CONNECTIONS Although the proteins that cause...Ch. 16 - EVOLUTION CONNECTION Some bacteria may be able to...Ch. 16 - SCIENTIFIC INQUIRY DRAW IT Model building can be...Ch. 16 - Prob. 12TYUCh. 16 - Prob. 13TYU
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