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jonny [76]
3 years ago
10

True or false a substitution in an exon that does not change the amino-acid product probaly occurred in the first base position

Biology
1 answer:
Irina18 [472]3 years ago
4 0

Answer:

True or False?

A substitution in an exon that doews not change the amino-acid product probably occurred in the FIRST base position.

False; Third

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When amino acids are linked together to form chains the molecule formed is called what?
choli [55]

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Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.

Explanation:

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How is a frog disected?
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<span>Lay the frog on its back, spread out its limbs, and pin them to the tray. Use forceps to lift the skin between the hind legs and make a small incision with a scalpel. Continue the cut up the center of the frog's body with scissors, being careful to cut through the skin only. Use forceps to hold the skin away from the muscle while you cut, if necessary. Make horizontal incisions just above the legs and just below the arms, then fold the resulting flaps back and pin them. (You may need to use a scalpel to help separate the skin from the muscle underneath as you fold it back.)Repeat the incisions as before, this time cutting through the muscle layer to a point just below the arms. Lift the muscle with the forceps to prevent cutting the organs underneath.When you reach the area just below the arms, turn your scissors and make horizontal cuts through the hard sternum. Repeat the horizontal cuts just above the arms, and then remove the bony strips entirely. Pin the remaining muscle flaps back, just as with the skin.<span>Look into the body cavity. The yellow finger-like projections on the sides are the fat bodies. It may be necessary to remove some of these in order to see the organs clearly. Likewise, a female specimen may have well-developed eggs filling the body cavity and obscuring the organs. Remove them as necessary.</span></span>
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How could a populations gene pool change overnight time?
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A mutation could do that.
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Humans have what type of circulatory system
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4 0
3 years ago
Read 2 more answers
PLEASE HELP WILL GET FAILING GRADE IF I CAN'T FINISH THIS ASSIGNMENT!!!
miskamm [114]
1. Depth: The water level in the Great Salt Lake fluctuates from year to year.  Water levels drop and salinity increases when less water flows into the lake than usual. Not only that, but the wetlands dry up and the shoreline recedes. The reason the shoreline shifts so dramatically is because it sits at the bottom of a broad and relatively flat basin. For a visual example, think of pouring water into a plate versus a bowl.  
Salinity: This Great Salt Lake has a high mineral content, as most terminal lakes are, which means that it is quite salty.   Even the fresh water flowing into the lake contains small amounts of dissolved minerals.  As water evaporates from the lake, the minerals stay behind.  As a result, these minerals have accumulated to very high levels because they have been left behind for thousands of years. The Great Salt Lake is between 3.5 and 8 times saltier than the ocean. However, the organisms that survive in such saline conditions have adapted to their surroundings through special features. 
Temperature: The Great Salt Lake has a very shallow depth, with an average of 14 feet deep and a mere maximum of 33 feet. This means that a lot of the surface area is exposed to the air, and is at the mercy of its seasonal temperature fluctuations. In the summer, rise to more than 80 degrees Fahrenheit while falling to below freezing in the winter.  
2. Depth: Salinity drops and lake levels rise during high precipitation years. Wetlands get covered by salt water, and the shoreline expands, sometimes destroying wildlife habitats and killing sensitive vegetation. 
Salinity:  <span>Changes in lake elevation are accompanied by changes in salinity. The salinity in the lake decreases as incoming fresh water dilutes the salt water.  This happens during the wet years.  During dry years, however, salinity increases as continued evaporation removes fresh water.  
</span>Temperature: Because of the lake's salt high content, the water doesn't usually freeze. However, as the temperature drops during the winter, less saline zones freeze solid, and most of the lake turns into a vivid pea-soup green color.  In mid-March, temperatures begin to rise again as brine shrimp begin hatching.  By late April, juvenile, and adult brine shrimp fill the water, serving as food for migrating and breeding birds.
3. Brine shrimp are smaller in highly salty water and larger in less salty water. Also, salinity levels also affect the rate of sexual development. Higher salinities produce adults who reach maturity quicker but are shorter in length. As salinity increases, the abdomen becomes longer relative to body length.  Low salinity may also cause cysts to crack prematurely, as well as allowing other competitors into the ecosystem.  High salinity results in offspring that develop quickly but are smaller and have a relatively longer abdomen.  In short, effects of abiotic conditions on brine shrimp are development rate, the rate of sexual maturity, the overall length of the abdomen, amount/type of food available, cyst density and location.
4. One limiting factor of brine shrimp are predators: corixids that consume brine shrimp, grebes that consume brine shrimp and their cysts, and humans that commercially harvest brine shrimp cysts.  Another limiting factor for brine shrimp is cooler temperatures.  They<span> are much more productive in warmer water and consume more phytoplankton.  However, when the lake water temperature is cold, the shrimp population tends to decline. </span>
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