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alex41 [277]
3 years ago
8

Why are covalent bonds form when an electron is completely lost or gained from an atom

Biology
1 answer:
Andrei [34K]3 years ago
7 0

Answer:

Covalent bonds are the types of Bond which is formed by sharing of an electron between two atoms of same element or two different elements. The bond which is formed by the completely lost or gained of an atom is known as ionic bond.

Explanation:

The most common example of covalent bond is formed from carbon atom. The valence of carbon atom is 4. Therefore, it is very hard to gain or lose an electron from the carbon atom. Therefore, the carbon tends to share the electron instead of completely losing or gaining the electron.

Ionic bond is very common and it can be formed by many elements from the periodic table. Ionic bond is more stable and stronger when compared to the covalent bond in nature.  

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What are the 4 nitrogenous bases found in DNA and what are their appropriate pairings?
Debora [2.8K]

Answer:

DNA has four nucleobases: adenine, thymine, guanine, and cytosine. The nucleobases in a DNA strand have preferred partners to form hydrogen bonds with. Cytosine pairs with guanine, and adenine pairs with thymine. These are the base pairing rules that allow DNA replication and protein synthesis to happen.

Explanation:

hope this helps <3

3 0
2 years ago
The concentration of solute is less on one sides of the membrane causing water to move into the cell causing the cell to swell.
andrezito [222]

When a cell is immersed in a hypotonic solution, the volume of the cell will rise as it will cause will be a net inflow of water inside the cell. If the concentration of solutes outside the cell is lower as compared to inside the cell and when the solutes are not able to cross the membrane, then the solution is called hypotonic to the given cell.

The ability of an extracellular solution to induce water to osmotically enter or depart a cell is known as tonicity.

Three terms—hypertonic, hypotonic, and isotonic—are employed in order to evaluate if a solution would cause water to move into or out of a cell:

  • If a cell is immersed in a hypertonic solution, it will lose volume because there will be a net flow of water out of the cell.
  • A cell will shrink if it is submerged in a hypertonic solution because water will escape the cell.
  • Since there is no net water movement in an isotonic environment, the cell's size remains constant.
  • A cell will absorb water and swell when it is exposed to a hypotonic environment.

Learn more about osmosis here:

brainly.com/question/11534932

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4 0
1 year ago
11 Pause
Luba_88 [7]

Answer:

I guess (D)

Explanation:

Linnaeus' hierarchical system of classification includes seven levels called taxa. They are, from largest to smallest, Kingdom, Phylum, Class, Order, Family, Genus, Species.

3 0
3 years ago
sodium potassium pump is an active transport. Which statement best describes why energy is needed to work correctly?
antiseptic1488 [7]

Answer:

because it is moving Na+ against its concentration gradient

6 0
3 years ago
What are the similarities between carbohydrates and lipids?
gtnhenbr [62]
<span>Carbohydrates are composed of single sugar units that make u starches which offer a ready source of your cell’s fuel. These units constitute monosaccharide, double-monosaccharide units called disaccharides and multiple-monosaccharide molecules while lipids are molecules that constitute hydrocarbons and make up the building blocks of the structure of living cells which stores energy in fat tissues for future uses. Both lipids and carbohydrates offer essential nutrients to diet.  Both of them play an important role in absorption and digestion but have their own mechanic ways.</span>


4 0
3 years ago
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