Unit 7 -Oceanography- Quiz

Someone new is preparing media for lab and adds buffers to the EMB agar that raise the pH to 7.8. The starting pH of EMB plates

mestny [16]

Answer and Explanation:

Eosin Methylene blue agar or EMB agar consists of sucrose, lactose, methylene blue and Eosin Y. These segments make it a differential medium which permits development of gram-negative microorganisms. Gram positive microscopic organisms develop inadequately on this medium.

It is particular for development of gram-negative microscopic organisms. It likewise separates between non-fermenting gram negative enteric microscopic organisms and lactose fermenting.

Lactose fermenting gram negative microscopic organisms use lactose to deliver corrosive which changes the shading to dull purple. Some of the lactose fermenter will exhibit dim provinces with green metallic sheen while different settlements with purple focus. Green metallic sheen is because of creation of solid acids.

In the event that the beginning pH is 7.8 rather than 6.9-7.3, the color won't change shading regardless of creation of acids. Consequently, it won't be conceivable to separate between lactose fermenter and non-fermenters.

7 0

3 years ago

How did Francesco Redi disprove the idea of spontaneous generation?

ANTONII [103]

Answer:Francesco Redi was against the theory of spontaneous generation. His intent for performing this experiment was to disprove the theory. He took six jars and filled them with decaying meat. He left three of these jars open and sealed the other three.

Explanation:

7 0

3 years ago

Design your own scenario related to Bacteria or Viruses. Identify the independent and dependent variables.

timurjin [86]

Answer:

An experiment where an antibiotic is tested against bacteria. The antibiotic can vary in its concentration for example, different amounts are applied to a sample of bacteria to see if it is affected by the action of the antibiotic and if so, in what concentration. So, the independent variable is the concentration of antibiotic while the dependent variable is the survival (or not) of the bacteria.

Explanation:

An independent variable is a variable that represents a quantity that the scientist modifies in an experiment. A dependent variable represents a quantity whose value depends on how the independent variable is modified. This is the variable being studied and measured.

So, an example of this applied to bacteria or viruses could be:

<u>An experiment where an antibiotic is tested against bacteria</u>. The antibiotic can vary in its concentration, different amounts are applied to a sample of bacteria to see if it is affected by the action of the antibiotic and if so, in what concentration. So, the independent variable is the concentration of antibiotic while the dependent variable is the survival (or not) of the bacteria.

To complete the experiment, an antibiotic whose effect is already known can be used as a positive control. That is, it is already known to kill the bacteria. And as a negative control you can simply use water, which has no effect and is known not to kill the bacteria. In this way, we validate the results and make sure that there is not something else that is affecting the bacteria and that only the antibiotic being studied has an influence.

5 0

3 years ago

What should be the genotypes of the parent flowers (P generation) if he wants to ensure that all of the

garri49 [273]

Answer:

If the trait for tall and trait for yellow are recessive: ttyy and ttyy

If the trait for tall is dominant and trait for yellow is recessive: TTyy and TTyy, Ttyy and TTyy

If the trait for tall is recessive and trait for yellow is dominant: ttYY and ttYY, or TtYy and TTYY

If the trait for tall is dominant and trait for yellow is dominant TTYY and TTYY, or TtYy and TTYY

4 0

4 years ago

Read 2 more answers

Divorce is most likely to occur within the first _____ year(s) of marriage.

Alexxx [7]

////////// it is 5 /////////

5 0

3 years ago