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laiz [17]
2 years ago
15

When does afterglow occur?​

Biology
2 answers:
Damm [24]2 years ago
4 0

An afterglow may appear above the highest clouds in the hour of fading twilight or be reflected off high snowfields in mountain regions long after sunset. The particles produce a scattering effect upon the component parts of white light. The opposite of an afterglow is a foreglow, which occurs before sunrise.

dlinn [17]2 years ago
4 0

Answer:

<em>afterglow occurs after the comedown. Afterglow slowly fades, but can last as short as 24-hours, while some positive post-acute phase of psychedelic drug effects </em><em> have been reported to extend between 6 and 8 weeks</em><em>.</em>

Explanation:

Thank you!

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imagine a cell-surface receptor protein is being newly synthesized. How can it get into the membrane that it will ultimately be
motikmotik

Answer:

the steps for a new receptor synthesis:

Explanation:

Do not forget the steps vary from an eukarityc cell to prokarityc one.  

IN AN EUKARYOTIC CELL:

1- Transcription: in the nucleus, mRNA is synthesized from the DNA sequence that codifies the protein. Exons are spliced if needed by spliceosomes.  

2- From nucleus into cytoplasm: mRNA goes through nuclear membrane into the cytoplasm were ribosomes, substrates for protein synthesis and other organelles are.

3- Ribosomes recognize a signal in mRNA and start reading the genetic code, three consecutive nucleotides at a time and adjust the correspondent tRNAs (tRNAs carry the aminoacids)  

4- Peptide bonds are formed between consecutives aminoacids, and a polypeptide is build up according to the mRNA sequence.

5- (The mRNA has a signal that is recognized by the rough endoplasmic reticulum) The peptide goes into this reticulum (RER) and then into Golgi apparatus. (more chemical modifications are made if needed). By this moment the protein has an inserted portion in a lipid membrane.

6- The protein is transported in a vessel that finally fusions with cytoplasmic membrane and the receptor is in destiny. Hydrophobic aminoacid sequences are inserted in membrane.

IN A PROKARYTIC CELL:

1- Transcription (no splicing is needed, there are not exons)

2- There are not nucleus and cytoplasm divided (no transport)

3- Ribosomes recognize a signal in mRNA and start reading the genetic code, three consecutive nucleotides at a time and adjust the correspondent tRNAs (tRNAs carry the aminoacids)

4- Peptide bonds are formed between consecutives aminoacids, and a polypeptide is build up according to the mRNA sequence.

5- The mRNA has a signal that is guides the growing protein to cellular membrane. Hydrophobic aminoacid sequences are inserted in membrane.

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From his observations of organisms in the Galapagos islands, Darwin reasoned that _____. See Concept 22.2 (Page) View Available
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Darwin reasoned that natural selection organisms had adapted to new environments, giving rise to new species. It is a principle of speciation.

<h3>Speciation, natural selection and environment</h3>

Different environmental pressures (e.g. the type of food) lead to different evolutionary pathways in genetically related organisms.

The organisms subject to different environments evolve as a consequence of natural selection in order to adapt (adjust) to their corresponding environments.

In consequence, this process may eventually lead to speciation due to the emergence of reproductive isolation barriers.

Learn more about natural selection here:

brainly.com/question/23929271

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In the enzyme reaction above, catechol is the substrate, oxygen is a reactant, catechol oxidase is the enzyme, benzoquinone is t
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