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erma4kov [3.2K]
3 years ago
12

Describe the role of signal molecules in activating gene expression at the appropriate time

Biology
1 answer:
Sholpan [36]3 years ago
6 0
Some genes only need to be expressed or produced when needed. For example, fibrinogen is a protein that needs to be produced when a person needs to clot. A signal protein 'signals' or tells the DNA to start producing that particular protein. Imagine if the protein was produced all of the time at the same quantities...a person would be prone to strokes and other sicknesses that are caused by blocking the flow of blood to tissue.
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23. When washing tableware in a three compartment sink, the water temperature should be at least ) 90F (32 degrees) 100 degrees
nadya68 [22]

Answer:

The water temperature should be at least 110^{0}F (43^{0} C).

Explanation:

Temperature is a measure of the degree of hotness or coldness of a substance. It is measured either Kelvin, in degree Fanrenheit or Celsius. These scales can be converted from one to another.

To ensure appropriate or proper cleaning of table wares, hot water at required temperature is adviseable for use. This is because most germs can not survive under hot condition, thus they die.

Washing with water of at least 110^{0}F (43^{0} C) temperature in a three compartment sink helps to kill germs on the table ware.

5 0
3 years ago
The international date line is found at which degree longitude
Aleonysh [2.5K]
The International Date Line is found at 180 degrees longitude either east or west. :D
5 0
3 years ago
Read 2 more answers
3. Why is it sometimes necessary to use a model that is "not to scale"?
joja [24]
My answer: Because the actual thing you might be modelling might be too small or large to replicate, (for example you cannot draw a plant cell TO SCALE because it’s way too small to see with a bare eye).
And if the item is too big, you won’t be able to fit it in a small space; if you were to draw it or create it in 3D.

I hope this helps!
Sorry if the response is too short, try rewording if you need to :)
6 0
3 years ago
2. Considering the wide diversity of life forms, which molecule would the majority of the Scientific Community consider to be th
Lubov Fominskaja [6]

Answer:

Protein

Explanation:

Considering the wide diversity of life forms, the majority of the Scientific Community will consider protein molecule to be the more likely candidate for genetic material, despite Griffith's findings regarding the "transforming factor".

8 0
3 years ago
The prokaryotic cells that were the first to add significant quantities of oxygen to Earth's atmosphere are classified as _____.
Ahat [919]

Answer:

f. cyanobacteria

Explanation:

Cyanobacteria are a group of photosynthetic bacteria. They have the ability to use water as a source of an electron during the process of photosynthesis. Splitting of water produces molecular oxygen that is released into the surroundings. In this way, cyanobacteria release oxygen gas in the air. The primitive atmosphere of the earth was reducing and did not have oxygen gas. The first photosynthetic organisms that could split water during photosynthesis are supposed to be cyanobacteria. These prokaryotes added oxygen to the atmosphere of the early earth and gradually made it oxidative from reducing.

7 0
3 years ago
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