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trasher [3.6K]
4 years ago
10

Home to the Southern Watershed, located in southeastern Virginia and making up the southern portions of the cities of Chesapeake

and Virginia Beach, this is one of the most biologically diverse regions of the state. This area supports more than 40 rare plant species and 10 terrestrial, estuarine, and palustrine wetland communities. Within these ecosystems, the fishing industry prevails and the economic value of the annual commercial fishing harvest is about $500 million. But the mix of the catch is changing and several valuable commercial aquatic species of the Bay have declined over the years. What is the MOST LIKELY reason for this decline in aquatic species in Virginia's Southern Watershed?
Biology
2 answers:
Delvig [45]4 years ago
6 0
Over fishing and habitat loss
telo118 [61]4 years ago
6 0

Answer:

Overfishing

Explanation:

The information in the description clearly states that the fishing industry is the most preeminent economic activity in the area and with an annual harvest of nearly $500 million there is more than sufficient reason to be concerned and to investigate the health of the populations to look for a more sustainable use of the fishing resources.

.    

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The germ theory of disease established that many diseases are caused by?
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3 years ago
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:

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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.

8 0
3 years ago
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