Table of Contents
What is meant by Diauxic growth?
Bi-phasic or diauxic growth is often observed when microbes are grown in a chemically defined medium containing two sugars (for example glucose and lactose). Typically, the two growth stages are separated by an often lengthy phase of arrested growth, the so-called lag-phase.
What is a diauxic shift?
Keyword: diauxic shift The switch from rapid fermentative growth in the presence of a rich carbon source to slower exponential growth by aerobic respiration using ethanol once the preferred carbon source has been exhausted.
What is asynchronous growth of bacteria?
An asynchronous population of bacteria is filtered whereby the cells are adsorbed in the pores of the membrane filter. In the adsorbed state the cells continue dividing producing progeny cells which are not adsorbed.
What is Diauxic growth quizlet?
Diauxic growth refers to the phenomenon in which a cell first uses up one type of sugar (such as glucose) before it begins to metabolize a second sugar (such as lactose). In this case, it is caused by gene regulation.
What is exponential growth phase?
The exponential phase of growth is a pattern of balanced growth wherein all the cells are dividing regularly by binary fission, and are growing by geometric progression. The cells divide at a constant rate depending upon the composition of the growth medium and the conditions of incubation.
What is catabolite repression describe the regulation of lac operon in E. coli during Diauxic growth?
Catabolite repression is positive control of the lac operon. The effect is an increase in the rate of transcription. In this case, the CAP protein is activated by cAMP to bind to the lac operon and facilitate the binding of RNA polymerase to the promoter to transcribe the genes for lactose utilization.
What are the two types of growth system?
The equation above is very general, and we can make more specific forms of it to describe two different kinds of growth models: exponential and logistic. When the per capita rate of increase ( r) takes the same positive value regardless of the population size, then we get exponential growth.
What is early growth stage?
Early stage businesses generally have a tested prototype or service model and have developed a business plan. The company may be generating early stage revenue but might not be profitable yet. Growth. Businesses in the growth stage are in commercial operation with solid traction and existing customers.
How are the functions of the lac repressor and Trp repressor similar to each other and how are they different?
how are the functions of the lac repressor and trp repressor similar to each other, and how are they different? both repress transcription. they prevent RNA polymerase from transcribing the operons. they are different with regard to effects of their small effector molecules.
How are constitutive proteins different from inducible proteins?
Constitutive genes are those that are always active. Genes for ribosomes are an example. They are constantly being transcribed because ribosomes are constantly needed for protein synthesis. Inducible genes are those that have variable activity, depending on the needs of the cell.
What causes exponential growth?
Exponential growth is a process that increases quantity over time. It occurs when the instantaneous rate of change (that is, the derivative) of a quantity with respect to time is proportional to the quantity itself.
What is diauxic growth quizlet?
What is the role of catabolite repression in the lac operon?
What are different types of growth?
Growth can be measured as linear, logarithmic, and exponential curve.
What are the 3 phases of growth?
There are three phases of growth – meristematic, elongation and maturation.
What is late growth stage?
The late Growth stage is a turbulent time with firms fighting just to survive. The turbulence is brought on by the slowing of growth. This is not to say that overall sales are declining but that the percentage of growth from one period to the next is declining.