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vaieri [72.5K]
3 years ago
11

When does the placenta begin to form?

Biology
1 answer:
AfilCa [17]3 years ago
6 0

Answer:A few days after fertilization

Explanation

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The interaction between which protein and ion initiates muscle coupling?
labwork [276]

Answer:

Troponin and calcium ions.

Explanation:

Troponin is a component of thin filament along with tropomyosin and actin. It is a protein complex to which calcium binds and start the production of muscular force.

Calcium also playing a very important role in muscle contractions, it binds with troponin and helping to move tropomyosin.

When calcium ion attached to troponin, then conformational changes occurs in troponin shape and moves which allow tropomyosin going away from its inhibitory position from the myosin-binding sites on actin. After this, the energized myosin head starts binding to the actin molecules and starts the cross bridge cycle, which helping in shortening the muscle's fiber.

3 0
3 years ago
Are you in favor of modifying species? Explain your answer.​
Pavel [41]

Answer:

depends on the day of the week really.. on Wednesdays not so much because Wednesdays just hit different but on any other day yea..

5 0
3 years ago
Whcih element is the most important?
kirill115 [55]
There are 6 elements that are the most important. The acronym, CHNOPS, is an easy way to remember these.
C - Carbon
H - Hydrogen
N - Nitrogen
O - Oxygen
P - Phosphorous 
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4 0
3 years ago
Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid
Lelu [443]

Answer:

The correct answer is - solubility

Explanation:

Solubility is the nature of the material that is a chemical property of that specific solute ability to dissolved in a solvent. The ability of solute or material in a solvent or liquid is measured by the term of the maximum amount of that material dissolved in the liquid at equilibrium.

Sugar and water is a great example of solubility. When sugar is missed in the water it dissolved in water and disappear in the water here sugar is solute and water is solvent.

Thus, the correct answer is - solubility.

4 0
3 years ago
Which of the following represents mutualism?
Darya [45]
Where are the options ??
6 0
3 years ago
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