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Andrej [43]
3 years ago
5

What kind of reactions provide a star with energy? HELP ME

Biology
1 answer:
solniwko [45]3 years ago
6 0
A star is provided with energy by a nuclear fusion reactions in its core. A nuclear fusion reaction occurs when the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become one helium atom.
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Proteins around which the long, linear strands of DNA are wrapped; they serve to keep the DNA untangled and to enable an orderly
igor_vitrenko [27]

Answer:

The correct answer is- Histone

Explanation:

DNA is approximately 2.2 m long thread which has to be adjusted in a microscopic nucleus so DNA must be in a supercoiled form to be present in the nucleus and this supercoiling of DNA is done on histone protein.

Histone protein is a positively charged protein that is made up of eight proteins so it is called histone octamer. Each histone has 2 copies of each protein that is H2A, H2B, H3, and H4.

DNA is negatively charged and histone protein is positively charged therefore DNA wraps around histone protein which causes the packaging of DNA. So the correct answer is histone protein.

3 0
3 years ago
A cell membrane is a phospholipid bilayer.
nirvana33 [79]

Answer:

b. The surfaces of the membrane are nonpermeable.

Explanation:

This helps the cell membrane to protect the cell.

5 0
2 years ago
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erastova [34]

Answer:

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Explanation:

7 0
2 years ago
Which of the following is not a characteristic of fungi
fgiga [73]
I know you didn't post your answer choices but I believe your correct answer would their cell walls consist mainly of cellulose.

Because cellulose definition- 
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Meaning it cannot have fungi.</span>
3 0
3 years ago
Since 1997, food allergies in children have increased by 50%. Why is this so?
Ipatiy [6.2K]
Im guessing the increase of GMO foods and excess preservatives and chemicals that may provoke certain food intolerances and allergies.
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