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Katyanochek1 [597]
4 years ago
8

How does a long strand of double-helical dna fit into the nucleus?

Biology
1 answer:
morpeh [17]4 years ago
5 0

Answer:

The long strands of double-helical DNA wrap around histone proteins. The wrapping goes on and on to achieve the secondary and tertiary level of packing. In the end, the whole thing is highly packed enough to fit inside the nucleus of a single cell.

Explanation:

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The exodus of medical professionals from africa to europe is an example of brain drain as it has the potential to __________.
Marat540 [252]

<span>Out of the following given choices;</span>

<span>A)   </span>spur economic development in Africa

B) impede economic development in Africa

C) impede economic development in Europe

D) spur economic growth for those medical professionals

<span>The answer is B. Brain drain means a country is losing its professionals to the external market rather than working in the local market due to unfavorable local conditions. The country loses because it has few medical professionals to treat its people hence it carries a higher burden of diseased people.  Additionally, to cater to this gap, it has to import these medical services which is more expensive than keeping local talent. </span>






5 0
3 years ago
In a hypothetical situation, a bacterium lives on the surface of a leaf, where it obtains nutrition from the leaf's nonliving, w
Rashid [163]

Answer:

The correct ecological sequence regarding this case, to answer your question: What is the correct sequence of ecological roles played by the bacterium in the situation decribed here, would be: 1. mutualism, 2. Parasitism and finally 3. Nutrient recycler.

Explanation:

Ecological balance comes when species interact, and help each other out, by carrying out tasks that the other species cannot perform. When this happens, both species benefit from the presence of the other, and thus are kept in balance. However, conditions may change that will affect this balance.

In this case, we have a bacteria and a plant that are ecologically balanced with each other: the plant provides nutrients to the bacteria, and the bacteria helps the plant by maintaining other microorganisms away. However, when the conditions of the plant change, giving the bacteria access to its insides, which are more nutrient-rich, than the outside, these bacteria do not waste time and infect the plant, until it kills, and then decomposes, the plant. Given the sequence, the first part is known as mutualism: to species sharing benefits. Parsitism, because the bacteria infected the plant and lived now off it, destroying it. And finally, nutrient recycler because the bacteria breaks down the plant, decomposes it, returning to the ecosystem nutrients that were inside the plant.

7 0
3 years ago
Read 2 more answers
(Drag each tile to the correct location.)
Greeley [361]

Explanation:

  • A tentative statement used to guide scientific investigations – scientific hypothesis

  • Makes predictions about future events – Scientific hypothesis

  • Can be tested by many independent researchers – Scientific hypothesis

  • Based on observations of natural phenomena – scientific hypothesis and theory both.

  • A well-established, highly reliable explanation – scientific theory
3 0
3 years ago
How many atoms are in something dermines it’s
Blizzard [7]

Answer:

mass

Explanation:

the chemical formula for water is H20 which means every molecule of water has 2 atoms of hydrogen and one atom of oxygen. Here comes the key part. from the periodic table of elements one sees that one mole of hydrogen atoms weight 1 gram while one mole of oxygen weights 16 grams.

8 0
3 years ago
Who is Bill Nye the science guy?
ser-zykov [4K]
Bill Nye hosted his own show called "Bill Nye the science guy" He was born on November 27, 1955, in Washington DC.  He was a science communicator, television presenter, and mechanical engineer. 
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