Notice: Payments for answers will end 4/10/2017. Click for more info.
You have new items in your feed. Click to view.
Question and answer
Q: explain the conditions needed for the growth of microorganisms
A: This varies depending on the type of bacteria. For example, warmblooded animal pathogenic bacteria require a temperature of around 98oF, a correct entry site, and for the host to be susceptible to that type of bacteria. [ Thermo-phillic bacteria require extremely hot temperature to grow. Viruses require a healthy host cell in order to get its DNA/RNA replicated. Parasites require the host body
to be healthy enough to sustain itself and the parasite. ]
Expert answered|Fanboy|Points 1000|
Question
Asked 4/17/2012 7:19:28 AM
Updated 5/10/2013 4:11:49 PM
1 Answer/Comment
Get an answer
New answers
Rating
0
Most micro-organisms require food, warmth, moisture, oxygen, time and a certain pH level in order to grow and multiply.

Moulds
•Most moulds are saprophytic i.e. they feed on dead organic matter. They grow on many foods especially fruit, bread, jam and cheese.
•Most moulds are mesophiles i.e. they thrive at temperatures between 20 and 45 degrees Celsius. Freezing (-18 degrees Celsius) inactivates mould growth. Temperatures below 15 degrees Celsius including fridge temperatures (1 to 4 degrees Celsius) retard mould growth. Cooking temperatures above 75 degrees Celsius destroy moulds.
•Moulds grow best in humid moist conditions, on foods with water present in liquid form. Frozen foods are unsuitable.
•Moulds are aerobic i.e. they require oxygen. As a result they grow on the surface of solid foods e.g. jam, and throughout open structure foods e.g. bread.
•Moulds favour slightly acidic conditions of pH 4 to pH 6. Extremely acidic or alkaline conditions inhibit mould growth.
•Moulds need time in order to multiply.

Yeast
•Yeast feeds on carbohydrates.
•Yeast thrives at temperatures between 25 to 30 degrees Celsius. Low temperatures inactivate yeast, while high temperatures of about 60 degrees Celsius kill yeast.
•Yeast needs moisture in order to grow.
•Yeast is a facultative organism i.e. it can live with or without oxygen.
•Yeast grows best in an acidic environment.
•Yeast needs time to grow.

Bacteria
•Some bacteria are saprophytic, and some are parasitic. Saprophytic bacteria i.e. those that feed on dead organic matter, include those bacteria which are present in soil and food and cause decomposition. Parasitic bacteria i.e. those that feed on living matter, cause diseases in humans, plants and animals.
•Bacteria have a very wide temperature range. Some are psychrophiles i.e. they thrive at low temperatures of -5 to 20 degrees Celsius, e.g. some clostridia bacteria.
Added 5/10/2013 4:11:49 PM
Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
25,768,353 questions answered
Popular Conversations
A person who is lactose intolerant would have difficulty digesting ...
Weegy: A person who is lactose intolerant would have difficulty digesting : Low-fat cheesecake with raspberries. ...
6/16/2017 2:06:32 PM| 1 Answers
To derive energy from food, you must eat foods that contain ...
Weegy: To derive energy from food, you must eat foods that contain carbohydrates, proteins, and fats. User: Which of ...
6/16/2017 2:08:12 PM| 1 Answers
_______________ is a small Buddhist kingdom. ...
Weegy: Bhutan is a small Buddhist kingdom. User: South Asia was part of which supercontinent right before it broke ...
6/20/2017 11:41:02 AM| 1 Answers
You finished cutting up a raw chicken and put it in the oven to cook. ...
Weegy: You finished cutting up a raw chicken and put it in the oven to cook. You should: Run the cutting board and ...
6/19/2017 4:23:18 PM| 0 Answers
Air is passed from the trachea into the lungs through two large tubes ...
Weegy: Air is passed from the trachea into the lungs thought two large tube called bronchi.
6/19/2017 3:43:24 PM| 0 Answers
On a topographic map, contour lines that are farther apart indicate ...
Weegy: On a topographic map, contour lines that farther apart indicate a more gentle slope.
6/20/2017 5:59:29 PM| 0 Answers
A(n) _____ is the act of or process of arriving at a conclusion from ...
Weegy: Inference is the act of or process of arriving at a conclusion from facts or a premise. ]
6/20/2017 5:51:52 PM| 0 Answers
A(n) _____ is a presupposition from which a conclusion is drawn.
Weegy: A premise is a presupposition from which a conclusion is drawn.
6/20/2017 5:51:25 PM| 0 Answers
Browning was accused of self-worship when he wrote a poem that ...
Weegy: Browning was accused of self-worship when he wrote a poem that modeled Tennyson.
6/20/2017 4:31:57 PM| 0 Answers
_____ is the set of assumptions about the organization and its goals ...
Weegy: Organizational culture is the set of important assumptions about the organization and its goals and practices ...
6/20/2017 3:49:57 PM| 0 Answers
Which one of the following choices is most accurate about ...
Weegy: The most accurate statement about fat-soluble vitamins is: They can be stored in the body.
6/16/2017 2:07:19 PM| 0 Answers
High triglycerides increase the risk for which one of the following ...
Weegy: High triglycerides increase the risk for Heart disease.
6/16/2017 2:05:59 PM| 0 Answers
Weegy Stuff
S
L
Points 30 [Total 1371] Ratings 0 Comments 0 Invitations 3 Offline
S
Points 17 [Total 17] Ratings 0 Comments 7 Invitations 1 Offline
S
Points 10 [Total 10] Ratings 0 Comments 0 Invitations 1 Online
S
Points 10 [Total 10] Ratings 1 Comments 0 Invitations 0 Offline
S
R
Points 3 [Total 19] Ratings 0 Comments 3 Invitations 0 Offline
S
Points 3 [Total 3] Ratings 0 Comments 3 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 2 [Total 72] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.