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kakasveta [241]
2 years ago
8

James is working with the lac operon of Escherichia coli (E. Coli). He places the bacteria on a plate of growth media. The lac O

peron of E. Coli is shown. Based on the current understanding of this operon, which hypothesis would be useful for James to test?
Biology
1 answer:
Crazy boy [7]2 years ago
7 0

Answer:

A.

Explanation:

Lac Operon is defined as an operon that is used by E.coli for transporting and metabolizing lactose.

Allolactose is a disaccharide like lactose, that binds to lac repressor and restrict its binding with DNA. It triggers expression of a operon or gene.

So, adding allolactose to the bacterial growth media, block the activity of lac repressor and trigger the activity of bacteria to metabolize the sugar lactose.

Hence, the correct answer is "A."

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______ polymers can be produced in large quantities at low cost.
lorasvet [3.4K]

Electrical products

Explanation - Polymers of electrical products can be produced in large quantities and low cost. This type of polymer are non-conductive in nature. However, they very high heat resistance property. Polymers for electrical products can mold itself in various shapes and sizes and also can reach very minute areas.

Polymers vary from one item to another. Polymers for commercial packaging is different from polymers of electrical products. Thus, polymers need to be chosen properly according to the use and its effectiveness.  

4 0
3 years ago
Research and identify a vestigial structure of an organism of your choosing.
Mariana [72]

Answer:

The one of best example would be appendix in humans.

Explanation:

In the past, the appendix may have helped in the digestion of the plants by producing mucus and prevent any type of infection. Plants with a high content of cellulose are digested with the help of the appendix as reported.

It is not a part of the human digestive system and considers as a vestigial organ. Vestigial organs are the organs that are present in an organism with no particular function and their removal will not lead to any harm. Humans do not need it because our digestive system is more efficient and works better in the first stages of digestion than they used to.

Thus, the correct answer is - appendix in humans.

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3 years ago
Defining Diseases Use the drop-down menus to complete each sentence. occurs when the immune system attacks the body. is often ca
Annette [7]

Answer:

1. Lupus

2. Cardiovascular disease

3. Huntington disease

4. Cancer

5. Diabetes

Explanation:

A disease can be defined as any harmful or abnormal deviation of the body of a living organism from its functional state or normal structure, which is typically accompanied by certain signs and symptoms.

Basically, a disease negatively affects the function or structure of the body of a living organism.

The different types of diseases experienced by living organisms include the following;

1. Lupus: occurs when the immune system attacks the body. It is referred to as an autoimmune disease.

2. Cardiovascular disease: is often caused by obesity resulting from overeating and poor nutrition.

3. Huntington disease: is caused by DNA changes in a single gene and affects the nerve cells in the brain.

4. Cancer: is caused by uncontrolled cell growth.

5. Diabetes: occurs when the pancreas does not produce enough insulin, or the body does not respond properly to it.

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