Microbiology: Principles and Explorations
10th Edition
ISBN: 9781119390114
Author: Black
Publisher: WILEY
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Chapter 3, Problem 2.3SC
Summary Introduction
To describe: That why does a higher pH 11 indicates a stronger base than pH 9 whereas a higher number of pH 5 indicates a weaker acid than pH 3.
Introduction: The hydrogen atoms that are involved in a
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Classify the following nitrogenous bases into purines or pyrimidines.
NH2
NH2
CH
CH
HN
-NH
HN
CH
-NH
EN
CH
NH2
H
Guanine
Cytosine
Uracil
Adenine
Thymine
Purine
Pyrimidine
C) Mercury bonds with the side chain of an amino acid and
causes the protein structure to
distort.
5) List the names of the 5 different base pairs and their letter
code. Identify if they are a)pyrimidines or purines, and b)
how many hydrogen bonds formed by each base:
A nucleic acid with a sequence 5’-AGCUUGAGCGUCCA-3’ was hydrolyzed with a strong acid. The hydrolyzate was then subjected to qualitative color reactions. Answer the following questions below.
1. Which bases will give a positive reaction (producing the expected result) with concentrated HNO3, 10% KOH, & then evaporation to dryness?
2. What is the color of the residue in (1)?
3. If the hydrolysate is treated with diphenylamine reagent, will it give a positive result?
4. The purple coloration obtain after treatment with Br2-H2O and Ba(OH)2 is due to what components in the hydrolysate?
Chapter 3 Solutions
Microbiology: Principles and Explorations
Ch. 3 - Prob. 1.1SCCh. 3 - Is it possible to have a molecule of an element? A...Ch. 3 - If isotopes can be thought of as twins, triplets,...Ch. 3 - What type of bonding is produced by the equal...Ch. 3 - Prob. 2.1SCCh. 3 - What properties of a water molecule enable it to...Ch. 3 - Prob. 2.3SCCh. 3 - Prob. 3.1SCCh. 3 - Prob. 3.2SCCh. 3 - How could you distinguish among carbohydrates,...
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- The pH of the amino acid shown below is:arrow_forwardWhere do terms 5’, 3’ in nucleic acids come from?arrow_forwardWhat are the names of the seven functional groups found in organic molecules? Underline the two that can act as an acid. Make the single group that acts as a base in bold lettering.arrow_forward
- Define the following terms:a. acidb. basea. weak acidd. weak basee. conjugate basearrow_forwardWhat are the differences and similarities of an acid and a base? What are some examples of each?arrow_forwardRefer to the following titration curve below: 13 12 11 10 9 7 6 5 4 3 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Volume of Titrant / mL - Unknown Acid 0.10 mol/L - titrant = NaOH 0.1 mol/L At ph 10.0, which form of histidine is most abundant? His2+ His- His° His+arrow_forward
- Proline provides structural regidity in proteins. What is the consequence of this on protein structure?arrow_forward(a) What is the net charge at neutral pH of a tripeptide containing only alanine? (b) How does the total number of negative and positive charges change following hydrolysis of the tripeptide?arrow_forwardAccording to chemist John Dalton, if one mole of nitrogen is combined with three moles of hydrogen to form one mole of ammonia (knowing that nitrogen, with an atomic number of 7, has an atomic mass of 14, and hydrogen, with an atomic number of 1, has an atomic mass of 1), then this compound will have an atomic weight (or molecular mass) of: 14 grams per mole (14 daltons) 17 grams per mole (17 daltons) 20 grams per mole (20 daltons) 22 grams per mole (22 daltons) 43 grams per mole (43 daltons)arrow_forward
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