What are the requirements for bacterial growth?

There are several factors contributing to bacterial growth, of which these can be very specific to different types of bacteria, but in general it is as follows.Nutrients is the most important factor, since without it, bacteria simply cannot grow. In a laboratory, nutrients is normally supplied in nutrient media (liquid = broth, solid = agar gel). Media provide key nutrients such as water, a source of carbon, a energy source and a source of nitrogen. Growth factors are also required, such as vitamins. Temperature is another key factor for bacterial growth. Bacterial metabolism is regulated by enzymes, which have optimum temperatures they work at. For mammalian pathogens this is around 37oC. pH is one of the other key factors contributing to bacterial growth. Most bacteria favour slightly alkaline conditions (pH 7.4). However, likewise with temperature, these values can fluctuate depending the specific favourable conditions for different types of bacteria. Oxygen, is the final key factor for bacterial growth. Many microorganisms require oxygen for metabolism and are known as obligate aerobes. Some grow best in presence of oxygen but can survive without it and are called facultative anaerobes. Others cannot grow in the presence of oxygen and are obligate anaerobes.

Answered by Alex P. Biology tutor


See similar Biology A Level tutors
Illustration of a video tutorial

Need help with Biology?

One to one online tuition can be a great way to brush up on your Biology knowledge.

Have a Free Meeting with one of our hand picked tutors from the UK’s top universities

Find a tutor

Related Biology A Level answers

All answers ▸

Compare and contrast the structure of DNA and RNA (3 marks)

How does meiosis produce genetic variation among daughter cells?

A white furred rabbit breeds with a black-furred rabbit and all of their offspring have a phenotype of grey fur. What does the gene for fur color in rabbits appear to be an example of?

What is homeostasis?

We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2022

Terms & Conditions|Privacy Policy