Why is it difficult to distinguish between asteroids and meteoroid

1 answer:

5 0

Both are large, rocky bodies in space but asteroids tend to stay in the asteroid belt, while meteoroids are a bit smaller and more active.

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Which nonmetallic minerals are most likely to be of high market value?

kvv77 [185]

Answer:

C) gemstones

Explanation:

Nonmetallic minerals (known as gemstones) such as diamond, emerald, topaz, ruby, agate, malachite, turquoise, jasper, and so on are of great importance in automobile industry and other industries of the world. Thus, there is increase in demand for them. This makes them to have the highest market value.

6 0

3 years ago

Why doesn't a negative stain colorize the cells in the smear?

iris [78.8K]

Answer:

It is impossible for a negative stain to colorize the cells in the smear because the chromogen of the negative stain carries a negative charge and is repelled as a result of the negative charge present on the surface of the cell. In this light, the stain can only colorize the background, thus permitting visibility of the capsule and the cell.

Explanation:

5 0

3 years ago

What term is used to describe bacterial cells that can naturally take up dna from their environment?

Maru [420]

<h2>The correct answer is: Competent cells</h2>

Explanation:

Bacterial cells have the capability of incorporating foreign naked DNA or deoxyribonucleic acid fragments from the environment or the exterior of the cell to the interior of the cell. This process is known as Transformation.
The bacterial cells which are able to undergo transformation are called Competent bacterial cells.
Some of the bacterial cells are naturally competent like<em> Bacillus subtilis, Streptocossus pneumoniae</em> while others like <em>Escherishia coli </em>need to be chemically treated to make them artificially competent.
In natural competence, the foreign DNA from the cell exterior is incorporated into the cell interior through specific protein complexes present in the plasma membrane of the bacterial cells.
In artificial competence, the negative charge on foreign DNA is masked by positively charged calcium ions (so that it is not repelled by the negative charge of the lipid bilayer of the bacterial cell plasma membrane) and then small pores are created in the lipid bilayer of the plasma membrane of the bacterial cells by giving a heat shock to the cells. This results in the uptake of the DNA by the bacterial cells.

3 0

3 years ago

Consider this plant cell.

defon

Answer:

sorry if i get it wrong its been a long time since i did this i believe its nucleus

7 0

2 years ago

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The image shows a bean-shaped bacterium with long tail-like projections streaming from it.

Leto [7]

I'd also say that the morphology presented in this picture is filamentous.
The reason for my believing this is that filamentous morphology concerns long visible chains, threads, or filaments, which you can see in the image.

8 0

3 years ago

Read 2 more answers