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Microbial Growth and pH

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Questions and Answers

What is the primary factor that determines the acidity or basicity of an environment?

The concentration of enzymes

The concentration of oxygen

The concentration of lipids

The concentration of hydrogen ions (correct)

What happens to the shape of large proteins, such as enzymes, when they are exposed to extreme pH levels?

They change shape and lose their catalytic properties (correct)

They become more active

They become more sensitive to temperature

They become more resistant to pH changes

What is the purpose of ion pumps in regulating the internal pH of a cell?

To increase the pH of the external environment

To maintain a near-neutral internal pH (correct)

To increase the concentration of hydrogen ions

To decrease the pH of the external environment

What is the effect of high pH on the structure of DNA?

The hydrogen bonds holding together strands of DNA are broken Signup and view all the answers

What is the role of buffers in regulating the internal pH of a cell?

To maintain a near-neutral internal pH Signup and view all the answers

How does a pH meter work?

By measuring the electric current produced by an acidic solution Signup and view all the answers

What is the pH range that alkaliphiles typically grow well in?

pH 8 to 10.5 Signup and view all the answers

What is the term for the lowest pH value that an organism can tolerate?

Minimum growth pH Signup and view all the answers

Which type of microorganism grows best in acidic pH conditions, especially below pH 5?

Acidophile Signup and view all the answers

What is the pH range that neutrophiles prefer for optimal growth?

pH 5 to 7 Signup and view all the answers

What is the purpose of the experiment described in the text?

To determine the effect of pH on E. coli growth Signup and view all the answers

Which of the following bacteria is an example of an extreme alkaliphile?

Agrobacterium Signup and view all the answers