Micobiology Quiz Study (Microbial Growth)

Microbial Growth

increase in cell size or number of cells

Growth

Increase in the number of cells

Binary Fission

cell division following enlargement of a cell to twice its minimum size

Generation Time

Time required for microbial cells to double in number

Chromosome

During cell division, each daughter cell receives a ______ and sufficient copies of all other cell constituents to exist as an independent cell

Cell elongates and DNA is replicated

What’s the first step of binary fission?

Cell wall and plasma membrane begin to constrict

What’s the second step in binary fission?

Cross-wall forms, completely separating two DNA copies

What is the third step in binary fission?

Cells separate

What is the fourth step in binary fission?

Cell wall

What is the outer layer of the cell?

Plasma membrane

What does the inner layer of the cell consist of?

DNA

What does the cell consist of?

Binary fission

an asexual reproduction method where a single cell divides into two genetically identical daughter cells

Binary fission

What is this an example of?

Divisomes

Fts proteins interact for form ____

FtsZ

_____ molecules form a ring around the center of the cell 7 attracts other proteins

Divisome

a protein complex in bacterial cells responsible for cell division.

Generation time

The time it takes one generation to form the next generation

Double

Generation times ____ in number

Shorter

Mist bacteria have _____ generation times than eukaryotic microbes

Growth

Generation time is dependent on ____ medium and incubation conditions

Incubation

Generation time is dependent on growth medium and _____ conditions

Nt=N0×2^n

The equation for generation times

The red line

Which like best represents the generation time?

Batch-culture

A closed-system microbial culture of fixed volume

Continuous culture

An open-system microbial culture of fixed volume

Chemostat

The most common type of continuous culture device

Lag phase

Interval between when a culture is inoculated and when growth begins

Exponential phase

Cells in this phase are typically in the healthiest state

Stationary phase

The growth rate of the population in this phase is at zero

Stationary phase

In this phase, either an essential nutrient is used up or water product of the organism accumulates in the medium

Death phase

In this phase, if incubation continues after cells reach stationary phase, the cells will eventually die

70%

The CDC estimates that about ___ Of human bacterial infections involve biofilms.

Biofilms

Most nonsocomial infections on medical catheters are caused by ______

84-421 days

How many days after exposure do pateients develop biofilms infection?

Culture Media

Nutrients prepared for microbial growth

Sterile

No living microbes

Inoculum

Introduction of microbes into medium

Culture

Microbes growing in/on culture medium

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