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zimovet [89]
3 years ago
15

Hector looks around his classroom at different objects. Which object reflects almost all of the light that strikes it?

Biology
2 answers:
Pie3 years ago
3 0

Hey there!

Your answer is a. white poster board.

The color an object appears as depends on what colors of light are reflected vs absorbed.

If an object appears as black, that means it doesn't reflect light, but it absorbs the light.

If an object appears as white, that means it doesn't absorb light, but it reflects the light.

White light is all colors of light mixed together.

So, the white poster board is the object reflecting almost all the light that strikes it.

Hope this helps!

IgorLugansk [536]3 years ago
3 0

Answer:

White poster board  

Explanation:

White light consists of all the colours in the rainbow. A white poster board reflects almost of the white light that hits it, so it appears white to our eyes.

B is wrong. Clear window gas is transparent. Almost all the light that hits it passes straight through

C. is wrong. A bright overhead light is a light source. It is generating its own light.

D is wrong. Black construction paper absorbs almost all the light that hits it. It reflects no light to our eyes, so it appears black.

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olga nikolaevna [1]

Answer:

  • Both organelles present their genetic material.
  • Both organelles divide by binary fission
  • Both organelles present a double membrane, the internal one looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
  • In the internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
  • The sizes of the organelles are similar to the size of some procaryotes

Explanation:

The endosymbiotic theory essentially states that some organules of the eukaryotic cells, such as mitochondria and chloroplasts, were once free-living bacteria. Probably, these organisms must have been phagocytized but not digested by another cell. These bacteria were able to adapt to their host, establishing a bond of dependence among each other.

Both organelles have many similarities with other free-living bacteria. For this reason, the theory states that chloroplasts derivate from cyanobacteria (because they both absorb sunlight, store the energy in ATP, and produce organic molecules) and that mitochondria derivate from rickettsias (because they produce ATP in the same way, by using the Krebs Cycle and Oxidative Phosphorylation).

This theory is supported by a few characteristics of the chloroplasts and mitochondria that suggest that they once were free cells. For example,

  • Both organelles present their genetic material. This DNI is independent of the cells´ DNA, is bi-catenary and circular, identical to the bacterial DNA, and very different from the one of the eukaryotic cells.
  • Both organelles divide by binary fission, not by mitosis, and can synthesize their ribosomes and organelles.
  • Both organelles present a double membrane, a characteristic that reinforces the idea of being phagocyted. The internal membrane looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
  • In fact, in this internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
  • Finally, the sizes of the organelles are similar to the size of some procaryotes

3 0
3 years ago
The virus is considered an exception to the cell theory because the mitochondria of the virus contain genetic material B. virus
likoan [24]

Answer:

The answer is B

Explanation:

6 0
2 years ago
Which pH is the most acidic?<br> a. 5<br> b. 7<br> c. 9
ivann1987 [24]

Answer:

pH 5 is the most acidic

Explanation:

The pH scale is known to range from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

4 0
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Answer:

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Explanation:

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The fact that Tibetans have a high level of myoglobin implies that they are able to take up and store more oxygen in their muscles since myoglobin is involved in storage of oxygen in muscle cells. Hence elevated levels of myoglobins enables the muscle cells to work more effectively.

5 0
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Answer:

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Explanation:

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