The indicator resazurin:
is pink in the absence of oxygen
is colorless in the absence of oxygen
drives off absorbed oxygen
none of the above are true
The correct statement is:
is pink in the absence of oxygen.
The correct answer is: is pink in the absence of oxygen.
The correct answer is "is pink in the absence of oxygen." To determine the correct answer, we can use the process of elimination and understanding of the properties of resazurin. Resazurin is commonly used as an indicator in microbiological experiments and is known for its color-changing properties.
Firstly, we can eliminate the option "is colorless in the absence of oxygen" because resazurin actually turns pink when oxygen is not present. This color change occurs due to the reduction of resazurin to resorufin in the absence of oxygen.
Secondly, we can eliminate the option "drives off absorbed oxygen" because resazurin is an indicator that undergoes a reduction reaction, but it does not actively remove or drive off oxygen.
Finally, we are left with the correct answer, "is pink in the absence of oxygen." This means that when resazurin is exposed to an environment lacking oxygen, it will change color to pink. The pink color indicates the reduction of resazurin to resorufin, which is the oxidized form of the indicator.