1. A gas pak in an anaerobic jar
a. contains sodium bicarbonate
b. removes oxygen from the air inside the jar
c. induces the formation of water molecules
d. all of the above are true
2. The indicator resazurin
a. is pink in the absence of oxygen
b. is colorless in the absence of oxygen
c. drives off absorbed oxygen
d. none of the above are true
3. The indicator methylene blue
a. Is blue in an anaerobic environment
b. Is blue when oxygen is present
c. Is pink when oxygen is present
d. Absorbs excess oxygen
4. Anaerobic metabolism
a. Produces energy through the breakdown of glucose without the use of oxygen
b. Produces lactic acid as a byproduct
c. Is the primary metabolic process in anaerobic organisms
d. All of the above are true
5. The anaerobic bacteria Clostridium botulinum
a. Produces a toxin that causes botulism
b. Can only survive in the presence of oxygen
c. Is commonly found in aerobic environments
d. None of the above are true
6. Fermentation
a. Is an anaerobic process that produces energy in cells
b. Can produce alcohol or lactic acid as byproducts
c. Is utilized in the production of yogurt and alcohol
d. All of the above are true
7. The gas produced during anaerobic respiration is
a. Oxygen
b. Carbon dioxide
c. Nitrogen
d. Water
1. d. all of the above are true
2. b. is colorless in the absence of oxygen
3. a. Is blue in an anaerobic environment
1. The correct answer is d. all of the above are true.
To explain how to get the answer, one can research what a gas pak is and its purpose in an anaerobic jar. A gas pak is a small packet containing chemicals that react to eliminate oxygen from the air. One common chemical used is sodium bicarbonate, which releases carbon dioxide gas when exposed to moisture. The carbon dioxide then reacts with any remaining oxygen, removing it from the air. This process creates an anaerobic environment, which is desirable for certain scientific experiments or procedures.
2. The correct answer is b. is colorless in the absence of oxygen.
To determine the answer, one can search for information about the indicator resazurin and its behavior in the presence or absence of oxygen. Resazurin is a dye commonly used as an indicator of oxygen in various laboratory settings. It is typically pink in the presence of oxygen and colorless in its absence. When oxygen is present, the dye undergoes a chemical reaction and changes color.
3. The correct answer is a. Is blue in an anaerobic environment.
To find the answer, one can look up information about the indicator methylene blue and its behavior in different environments. Methylene blue is a commonly used dye and indicator in various laboratory applications. It turns blue in the presence of certain reducing agents, such as those found in anaerobic environments. When oxygen is present, it tends to lose its blue color and become other shades, including pink. Thus, in an anaerobic environment, methylene blue remains blue.