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23 Cards in this Set

  • Front
  • Back
In a repressible operon the switch is normally in the ? mode and will be turned ? only when the nutrient is no longer required
on

off
Excess nutrients serve as a ? needed to block the action of a ? operon
co-repressor

repressible
Example of repressible operons are the ? and ? operons
trip and arg
When nutrients are no longer being used in a repressible operon they act as ? by attaching to the repressor and allowing it to attach to the ?
co-repressors

operator
Some infection therapy is based on the concept that certain drugs react with DNA, RNA, or ribosomes and alter ? expression.
genetic
Blocking gene expression is based on the premise that growth of the infectious agent will be inhibited by blocking its ? synthesizing machinery selectively
protein
Drugs that inhibit protein synthesis exert their influence on ? or ?
translation
transcription
Antibiotics often target the ? inhibiting ribosomal function and ultimately protein synthesis.
ribosome
Genetic change is the driving force of ?
evolution
Mutation happens when phenotypic changes are due to changes in the ?
genotype
A change in the genotype is due to and alteration in the ? sequence of DNA
nitrogen-base
A microorganism that exhibits a natural, non-mutated characteristic is the ? type.
wild
When a microorganism bears a mutation it is known as a ? strain, and these are good for tracking genetic events, unraveling organization, and pinpointing genetic markers
mutant
A random change in the DNA arising from errors in replication is a ? mutation
spontaneous
A mutation that results from exposure to known mutagens is a ? mutation
induced
? mutations involve addition , deletion. or substitution of single bases.
Point
A ? mutation is any change in the code that leads to placement of a different amino acid.
missense
A missense mutation can create a ?, nonfunctional protein or a protein that function in a ? manner or it might cause no significant alteration in protein ?
faulty

different

function
A ? mutation changes normal codon into a stop codon like ?
nonsense

UAA/UAG
A ? mutation alters a base but does not change the amino acid and thus has no effect
silent
A ? mutation is when a gene that has undergone mutation reverses to its original base compostition
back
Mutations that occur when one or more bases are inserted into or deleted from a newly synthesized DNA strand are ? mutations
frameshift
Frameshift mutation changes the ?- frame of the mRNA and nearly always results in a ? protein.
reading

non-functional