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Vesnalui [34]
3 years ago
7

Which of the following best defined weather :

Biology
1 answer:
wlad13 [49]3 years ago
8 0
The atmospheric conditions at a particular time
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Which of the following ideas is supported by Darwin's observation of local variation among tortoises in the Galapagos Islands A)
Hoochie [10]

Adaptation is supported by Darwin's observation of local variation among tortoises in the Galapagos Islands.

 

<span>In biology, an </span>adaptation, also called an adaptive trait, is a trait with a current functional role in the life of an organism that is maintained and evolved by means of natural selection. Adaptation<span> refers to both the current state of being </span>adapted<span> and to the dynamic evolutionary process that leads to the </span>adaptation.

 

The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

4 0
3 years ago
Fermentation is the pathway used in the_____of oxygen
OverLord2011 [107]

Answer:

hello!

Explanation:

Fermentation is another anaerobic (non-oxygen-requiring) pathway for breaking down glucose, one that's performed by many types of organisms and cells. In fermentation, the only energy extraction pathway is glycolysis, with one or two extra reactions tacked on at the end.

5 0
3 years ago
Please help i need to turn this in
makvit [3.9K]

Answer:

Normal Strand: alanine - methionine - histidine
Mutated Strand: glutamine - cysteine - no third amino acid.

Explanation:

<h3>mRNA Structure</h3>

Messenger ribonucleic acid (mRNA) is the RNA that is used in cells for protein synthesis. It has a single strand made by the transcription of DNA by RNA polymerase. It contains four nucleotides: Adenine (A), Guanine (G), Cytosine (C), and Uracil (U).

<h3>DNA Replication</h3>

Before transcribing, we need to create the complementary strand of the DNA. We're going to write out the nucleotides of the complementary strand by matching the nucleotides in these pairs: (A & T) and (C & G).

              Normal Strand: GCA ATG CAC
Complementary Strand: CGT TAC GTG

Next, we can transcribe this to find our mRNA. We're going to do the same thing to the complementary DNA strand, but with Uracils instead of Thymines. So our pairs are: (A & U) and (C & G)

Complementary DNA Strand: CGT TAC GTG
                        mRNA Strand: GCA AUG CAC

You'll notice that the mRNA strand is almost exactly like the new mRNA strand, but with Uracil instead of Thymine.

<h3>Reading Codons</h3>

Each set of three nucleotides is known as a codon, which encodes the amino acids that ribosomes make into proteins. To read the codons, you need to have a chart like the one I attached. Start in the middle and work your way to the edge of the circle. Some amino acids have multiple codons. There are also "stop" and "start" codons that signify the beginning and ends of proteins.

mRNA Strand: GCA AUG CAC
Amino Acids:   Ala   Met   His

Our sequence is alanine, methionine, and histidine.

<h3>Frameshift Mutations</h3>

A frameshift mutation occurs when a nucleotide is either added or removed from the DNA. It causes your reading frame to shift and will mess up every codon past where the mutation was. This is different than a point mutation, where a nucleotide is <em>swapped</em> because that will only mess up the one codon that it happened in. Frameshift mutations are usually more detrimental than point mutations because they cause wider spread damage.

<h3>Mutated Strand</h3>

Let's repeat what we did earlier on the mutated strand to see what changed.

              Mutated Strand: CAA TGC AC
Complementary Strand: GTT ACG TG
---
Complementary DNA Strand: GTT ACG TG
                        mRNA Strand: CAA UGC AC
---
mRNA Strand: CAA UGC AC
Amino Acids:   Glu   Cys   X
---
Our amino acid sequence is glutamine, cysteine, and no third amino acid.

As you can see, removing the first nucleotide of the strand caused every codon to change. The last codon is now incomplete and won't be read at all. If this happened in a cell, the protein that was created from this mutated strand would be incorrect and may not function completely or at all.

5 0
2 years ago
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Competition for resources will intensify because _____.
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The answer is c because many things are losing their habitat and food sources
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3 years ago
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In response to a stressful work deadline, jonas' heart rate increased and blood raced to his skeletal muscles. these physical re
GarryVolchara [31]

The right answer is the first phase of the general adaption syndrome.

The concept of stress was introduced by Hans Selye. He describes the mechanism of the adaptation syndrome, that is to say all the modifications that allow an organism to bear the consequences of a natural or operative trauma.

In fact, it is the double-perception of a state of divergence between a demand for adaptation at a given moment and the ability to cope with it. It is an energy expenditure. It can be positive or negative.

The stress syndrome evolves in three successive stages:

*"Alarm reaction": the defense forces are mobilized

*"Resistance stage": adaptation to the stressor

*"Stage of exhaustion": inexorably reached if the stressor is sufficiently powerful and acts a long time.

5 0
3 years ago
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