If my memory serves me right, the testes (plural) are the males genitals that store semen and belongs to the reproductive system.
you need to test both the experiment-organism and an organism which you already know is catalase-positive, in the same environment in order to compare the results and determine if your experiment-organism is catalase-positive. - See more at: http://www.chacha.com/question/why-is-it-advisable-to-perform-a-catalase-test-on-a-known-catalase%26%2345%3Bpositive-organism-along-with-the-organism-you-are-testing#sthash.oChX8ZqW.dpuf
It's advisable so that the oxidase test determines whether or not an organism has cytochrome oxidase in its electron transport chain.
It's advisable so that the oxidase test determines whether or not an organism has cytochrome oxidase in its electron transport chain.
Including an oxidase-positive control in a test of an unknown organism helps to confirm the presence of the enzyme oxidase in the test system. This control provides a baseline for comparison with the unknown organism to determine if it also produces oxidase. This is particularly important in biochemical testing to accurately identify the unknown organism based on its metabolic properties.
The scientist should perform a test cross between the organism and a homozygous recessive organism. If all offspring show the dominant trait, the original organism is homozygous dominant. If some offspring show the recessive trait, the original organism is heterozygous.
The positive organism for citrate utilization test is usually Escherichia coli. When this bacterium is able to grow on a citrate-containing medium, it will produce alkaline byproducts that change the pH of the medium, turning it from green to blue. This color change indicates a positive result for citrate utilization.
Inoculating a single tube per organism ensures that the test results are specific to that particular organism. Mixing multiple organisms in one tube can lead to inaccurate results due to potential interactions or competition between the different organisms during the test. Keeping the organisms separate helps to maintain the test's reliability and accuracy.
The organism added to the test tube was likely a photosynthetic organism, such as algae or a plant, that produces oxygen through photosynthesis in the presence of sunlight. The increase in oxygen observed over time is a result of this photosynthetic process where the organism uses sunlight to convert carbon dioxide and water into oxygen and glucose.
The organism added was likely a photosynthetic organism, such as algae or a plant. Photosynthetic organisms use sunlight to convert carbon dioxide and water into oxygen during photosynthesis. The increase in oxygen observed in the test tube is a result of this process taking place.
A test that shows the sulfer, indole, and motility of a micro organism.
green alga
MacConkey agar is yellow (due to the lactose in the agar). When an organism consumes the lactose, the agar turns purple. Purple indicates a positive test. If the organism doesn't use the agar, the agar stays yellow.