How do facultative anaerobes survive?

A facultative anaerobe is an organism which can survive in the presence of oxygen, can use oxygen in aerobic respiration, but can also survive without oxygen via fermentation or anaerobic respiration. Most eukaryotes are obligate aerobes, and cannot survive without oxygen.

What is meant by facultative Aerobes?

A facultative aerobe is an organism that makes ATP by anaerobic respiration. These bacteria require oxygen but can survive in absence of oxygen. These organisms do not require oxygen but can survive in presence of oxygen.

What are the characteristics of a facultative anaerobe?

Facultative anaerobes are usually defined as having three peculiar characteristics: (i) the ability to grow aerobically or anaerobically using oxygen (respiration) and organic com- pounds (fermentation) as final acceptors of electrons produced in catabolism; (ii) the preferential use of oxygen, if available, due to the …

What is facultative and obligate?

A facultative anaerobe is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation or anaerobic respiration if oxygen is absent. An obligate aerobe, by contrast, cannot make ATP in the absence of oxygen, and obligate anaerobes die in the presence of oxygen.

What does the term facultative anaerobe mean?

Facultative anaerobes are bacteria that can grow in both the presence or absence of oxygen. In addition to oxygen concentration, the oxygen reduction potential of the growth medium influences bacterial growth.

What does the term facultative anaerobe mean quizlet?

What does the term facultative anaerobe mean? Facultative anaerobes can grow with or without oxygen. More growth is evident when oxygen is present. Facultative anaerobes require oxygen for growth.

Where do facultative anaerobes live?

Staphylococci and Enterobacteriaceae are examples of facultative anaerobes. Staphylococci are found on the skin and upper respiratory tract. Enterobacteriaceae are found primarily in the gut and upper respiratory tract but can sometimes spread to the urinary tract, where they are capable of causing infections.

Can obligate anaerobes survive without oxygen?

Obligate anaerobes, which live only in the absence of oxygen, do not possess the defenses that make aerobic life possible and therefore cannot survive in air. The excited singlet oxygen molecule is very reactive. Therefore, superoxide must be removed for the cells to survive in the presence of oxygen.

Do facultative anaerobes tolerate oxygen toxicity?

Anaerobes, on the other hand, cannot grow in the presence of oxygen. Oxygen is toxic for them, and they must therefore depend on other substances as electron acceptors.

What does the term Mesophile mean?

: an organism growing at a moderate temperature (as bacteria that grow best at about the temperature of the human body) — compare psychrophile, thermophile.

Which term best describes an organism that can exist with or without oxygen?

aerobe, an organism able to live and reproduce only in the presence of free oxygen (e.g., certain bacteria and certain yeasts). Organisms that grow in the absence of free oxygen are termed anaerobes; those that grow only in the absence of oxygen are obligate, or strict, anaerobes.

What is the meaning of absence of oxygen?

Hypoxia (environmental), an environment with low, or near-zero, oxygen content, commonly called anoxia; Anaerobic (disambiguation), a technical word which literally means without air (where “air” is generally used to mean oxygen), as opposed to aerobic; Aerobic (disambiguation), antonym of anaerobic.