Microbiology: Principles and Explorations
10th Edition
ISBN: 9781119390114
Author: Black
Publisher: WILEY
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Chapter 8, Problem 4.3SC
Why are nitrates and nitrites, which have been added to sausages to retard bacterial growth and thereby prevent food poisoning, a dnager to humans?
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Why is it important to use a hyperthermophilic DNA polymerase in PCR?
a) Because only hyperthermophiles have DNA polymerases.
b) Because hyperthermophilic DNA polymerase is able to resist the saline reaction conditions.
c) Because hyperthermophilic DNA polymerase is faster than other polymerases.
d) Because hyperthermophilic DNA polymerase is able to resist denaturation at 95℃.
Bacteria and human beings are very different organisms. Why is it possible to combine their DNA and use a bacterium to make a human protein?
A DNA molecule consists of 500 nitrogenous bases, of
which 150 are G bases. So, the percentage of
nitrogenous base T is equal to?
choose the correct answer
A)20%
B)30%
C)40%
D)60%
Chapter 8 Solutions
Microbiology: Principles and Explorations
Ch. 8 - Compare and contrast chromosomes in prokaryotes...Ch. 8 - DNA is not always the gemetic material. What are...Ch. 8 - How could mutations give rise to new alleles of a...Ch. 8 - How does trandlation differ from transcription?Ch. 8 - Distinguish between leading and lagging strands.Ch. 8 - What do 5 and 3 refer to? How do they determine...Ch. 8 - Contrast the three kinds of RNA. Does DNA make all...Ch. 8 - What feeds back in feedback inhibition? What does...Ch. 8 - What is the inducer for the lac operon?Ch. 8 - Compare enzyme induction and enzyme repression.
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- Arrangement of nucleotides in DNA can be seen using which of the following instruments? a) Electron microscope b) Light microscope c) X-Ray crystallography d) Ultracentrifugearrow_forwardChemical analysis shows that a nucleic acid sample contains A, U, C, and G. Is this DNA or RNA? Why?arrow_forwardChlorambucil is a nitrogen mustard. What is the structure of its covalent adduct to DNA?arrow_forward
- Incorporating foreign DNA into the existing DNA of an organism will produce a different protein contrary to the one specified by the foreign DNA. Is it True or False?arrow_forwardBacteria and human beings are very different organisms. Why is it sometimes possible to combine their DNA and use a bacterium to make a human protein?arrow_forwardIn DNA extraction where ethanol was used why does the DNa floatarrow_forward
- The ratio of _____ in DNA is 1:1 A) guanine to adenine B) adenine to thymine C) cytosine to adenine D) uracil to cytosinearrow_forwardWhich of the following amino acids is unique in that it can bind both non-specifically to the DNA backbone as well as to specific DNA bases? a) Lysine b) Asparagine c) Arginine d) Phenylalanine e) Leucinearrow_forwardIn standard agarose gels used for the analysis of DNA, linear DNA fragments are separated on the basis of their... a) Size b) Charge c) Buoyancy d) Color e) Smellarrow_forward
- Which THREE of the following characteristics are the same in both DNA and RNA? A) deoxyribose sugar B) double-stranded C) phosphate group D) the nitrogenous base thymine E) the nitrogenous base adenine F) the nitrogenous base guaninearrow_forwardWhat is it about the structure of DNA that makes it stable (and allows it to be replicated so exactly)?arrow_forwardWhat is BAC DNA?arrow_forward
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