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Chapter 8: Microbial Genetics
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Positive
________ (direct) selection involves the detection of mutant cells by rejection of the unmutated parent cells.
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Transcription
________ is the synthesis of a complementary strand of RNA from a DNA template.
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genetic makeup
The genotype of an organism is its ________- all its DNA- the information that codes for all the particular characteristics of the organism.
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Phenotype
________ refers to actual, expressed properties, such as the organisms ability to perform a particular chemical reaction.
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eukaryotic genes
Thus, ________ are composed of exons, the regions of DNA expressed, and introns, the intervening regions of DNA that do not encode protein.
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donor
In all of the mechanisms, the transfer involves a(n) ________ cell that gives a portion of its total DNA to a recipient cell.
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Chromosomes
________ are structures containing DNA that physi- cally carry hereditary information; the ________ contain the genes.
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E coli
Noncoding regions called short tandem repeats (STRs) occur in most genomes, including that of ________.
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STRs
________ are repeating sequences of two- to five- base sequences.
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survival of new genotypes
The ________ is called natural selection.
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mutation
A(n) ________ is a permanent change in the base sequence of DNA.
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Any mutant microorganism
________ having a nutritional requirement that is absent in the parent is known as an auxotroph.
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flow of genetic information
The ________ can be shown as flowing from DNA to RNA to proteins, as follows:
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genetic code
The ________, the set of rules that determines how a nucleotide sequence is converted into the amino acid sequence of a protein.
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excess tryptophan
When ________ is present, the tryptophan acts as a corepressor binding to the repressor protein.
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repressible operons
In ________, the structural genes are transcribed until they are turned off.
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science of heredity
Genetics is the ________.
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Nucleotide excision repair
________ is not restricted to UV- induced damage; it can repair mutations from other causes as well.
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Genetic recombination
________ refers to the exchange of genes between two DNA molecules to form new combinations of genes on a chromosome.
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tRNA molecule
Each ________ has an anticodon, a sequence of three bases that is complementary to a codon.
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Messenger RNA
________ (mRNA) carries the coded information for making specific proteins from DNA to ribosomes, where proteins are synthesized.
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genetic information
The ________ in a cell is called the genome.
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Transcription
________ begins when RNA polymerase binds to the DNA at a site called the promoter.
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