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Olenka [21]
3 years ago
8

How can the shape of a molecule determine its polarity apex?

Biology
2 answers:
sukhopar [10]3 years ago
5 0

The shape of the molecule will determine the direction of each of the individual bond dipoles, and thus, will always play a role in determining the polarity of the molecule as a whole.

Think of each polar bond in a molecule as a little arrow pointing from positive to negative. This tells us that the bond dipole is a vector quantity.

Like any other vector quantity, the direction is a vital aspect of its description. So, the geometry of the molecule determines the direction that the bond dipole vectors point.

The polarity of the molecule results from adding up all these individual bond dipoles.


r-ruslan [8.4K]3 years ago
3 0

Answer:

Symmetrical molecules prevent polarity effects

Explanation:

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1. What did Darwin’s research on the Galapagos Islands show?
Iteru [2.4K]

Answer:

Darwin's research on Galapagos Island put forward his theory of natural selection.

Explanation:

1. Charles Darwin studied the similarities of the finches between the various islands of Galapagos. His study noted that the finches were similar from island to island making him to wonder about the origin of this species as these perfectly adapted to their environment. His compilation of observation about the finches, the fastest evolving vertebrates, described its behavior and appearances which changed according to the changing environment., thus making them to adapt quickly. These were further converted for his book 'The Origin of Species' that changed the concept of evolution.

2. Grants research on Galapagos Islands were conducted by Peter Raymond Grant and Barbara Rosemary Grant, both evolutionary biologists. Their work focussed on the Darwin's finches through processing of collecting blood samples and tagging them. They were able to indicate that changes within the species is evident within a single lifetime. Their study indicted that changes in populations takes place quickly and need not wait for long time as indicated in Darwin's theory.

3. The Galapagos Island is a ground to more species that have risen due to adaptation. Due to its remote location, it was possible for the scientists to conduct study about natural selection on biodiversity. THere are 18 species that have evolved from Darwin's finches.  The diversification observed in the finches were the shape and size of beaks.

The Darwin's finches developed over time with strong crushing and probing  beaks adapted to catch insects or crack nuts. Even some have sharp long beaks to drink blood.

Another species observed is the marine Iguana with adapted short blunt stout, and long tail to swim deep into sea.

The flightless cormorant found in this island, were adapted to survive as there was no necessity to fly. Instead their dense bodies, small feet, and powerful legs makes them to be good divers to hunt fish, eels, and small octopus.

4 0
3 years ago
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Please help
butalik [34]

The right answer is: The antibodies mistakenly identify the cells as foreign material.

The role of an antibody is to recognize a foreign antigen in order to neutralize it. They can achieve this thanks to the great specificity of their paratope, which recognizes only a very precise part of the antigen: the epitope. As soon as an antibody recognizes an epitope, the B lymphocyte that codes for that specific antibody multiplies and matures in order to synthesize the same antibodies, useful in large quantities.

The phenomenon described in the question is an autoimmunity mediated by autoantibodies.

An autoantibody is an antibody produced by the immune system and directed against one or more proteins of the individual himself

Many autoimmune diseases are due to the presence of these autoantibodies, but the presence of autoantibodies is not necessarily synonymous with such a disease.

Some scientists say that they could have a beneficial role in cleaning up cell debris resulting from a disease.

The way in which these autoantibodies are produced, their precise role, and the reason why they decrease in individuals with certain diseases, are all issues that remain unresolved.

8 0
3 years ago
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Why can't more than one sperm enter an egg?
Y_Kistochka [10]
<span>Only one sperm normally fuses with an egg because if more than one sperm fuses, through a process called polyspermy, development of the zygote usually stops.


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3 0
3 years ago
The NADPH generated by the pentose phosphate pathway primarily serves as a
Igoryamba

Answer:

Option-A

Explanation:

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The pentose phosphate pathway forms the electron carriers called NADPH and the ribose-5 phosphate.

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The NADPH is therefore involved in the formation of reducing biosynthetic pathways like fatty acid synthesis, cholesterol synthesis, and bile acid synthesis.

Thus, Option-A is the correct answer.

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Gemiola [76]
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