Genetics
Genetic control of the production of specific proteins at specific times would occur in which of the following situations?
Producing enzymes to metabolize specific sugars when those sugars are found in the environment When bacterial cells are getting ready to divide When bacteria are subject to heat stress
Constitutive genes ______.
are unregulated.
The binding of a small effector molecule to a regulatory protein changes the ___ of the regulatory protein, which alters its DNA-binding ability.
conformation
Unregulated genes have ______
constant levels of expression.
Unregulated genes are also called ___ genes
constitutive
Effector molecules influence gene expression by binding to DNA.
false
Gene expression is always the same.
false
Gene regulation is constant.
false
The rate of transcription initiation rarely influences overall gene expression.
false
Control of gene expression leads to the production of specific proteins to assist bacterial cells in responses to environmental stressors, preparation for cell division, and ______.
metabolism
A protein such as a repressor that inhibits transcription is exerting ___ control of transcription.
negative
The phenomenon in which the level of gene expression can vary under different conditions is gene
regulation
An inducer could bind to a(n) ______ and prevent it from binding to the DNA, or it could bind to a(n) ______ and cause it to bind to the DNA.
repressor; activator
What type of genes encode proteins the bacterial cell needs all the time?
Constitutive genes
A regulatory protein that increases the rate of transcription is a(n) ___
activator
Constitutive genes encode proteins the cell needs ______.
all the time
Examples of a(n) ___ stress that might require a bacterium to produce a specific protein include osmotic shock or heat shock.
environmental
Certain proteins help a bacterium survive environmental stress such as heat shock. These proteins are required ______.
only when confronted with the stress
Transcription regulation by an activator protein is considered to be ______ control.
positive
A benefit of gene regulation is that encoded proteins are not made when they are not needed. This ______.
prevents the cell from wasting energy
In bacteria, the most common way to regulate gene expression is by influencing ______.
the rate of transcription initiation
A benefit of gene regulation is that encoded proteins will not be produced when they are not needed.
true