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sladkih [1.3K]
3 years ago
7

Why are stop and start codons signals necessary for protein synthesis

Biology
1 answer:
Kruka [31]3 years ago
5 0

Answer:

The start and stop codons —part of the mRNA's genetic code— are necessary because they indicate the exact length a protein should have.

Explanation:

The sequence of bases contained in an mRNA strand is the genetic code that allows the synthesis of specific proteins.  The mRNA information is organized into triplets or codons, whose function is :

  • <u><em>To code the amino acids </em></u><em>that will be incorporated into the protein to be synthesized. </em>
  • <u><em>To establish the sequence of amino acids</em></u><em> of a peptide or protein, which depends on the sequence of codons formed by nitrogenous bases. </em>
  • <u><em>To mark the beginning of the synthesis</em></u><em>, with the starting codon that, in addition, codes the amino acid Methionine. </em>
  • <u><em>Establish the end of the synthesis</em></u><em>, through the three stop codons, UAA, UAG and UGA. </em>

The importance of the start and stop codons is that they establish the exact length that, genetically established, a specific protein must have.

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Life Cycle


Mealworms that birds, reptiles, and other animals love aren’t really worms. They are the larvae of darkling beetles. There are over 20,000 different types of darkling beetles and mealworms come from the species Tenebrio molitor.

A darkling beetle experiences complete metamorphosis which means that it has four distinct stages of life. The four stages are egg, larva, pupa, and adult. The amount of time a darkling beetle spends in each stage can vary greatly due to environmental factors like temperature, humidity, food, and water.

Egg
The first stage of life is spent as an egg. The white bean-shaped egg is tiny and about the size of a speck of dust. The egg is sticky and is quickly concealed by dirt, dust, and substrate. It will take around one to four weeks for an egg to hatch and the larva to emerge.

Larva
The second stage of life lasts about eight to ten weeks and is spent as a brown larva. This is the stage where the insect is a mealworm. When first hatched, it is quite small but will grow to one to one and a half inches long.

Since it has a hard exoskeleton, the worm will need to molt and shed its hard outer shell in order to grow. Molts will occur ten to twenty times during this stage of life. A recently molted worm will be soft and white, but the exoskeleton will quickly harden.

A mealworm spends its time eating and growing in order to save up energy for the next transformation.

Pupa
During a mealworm’s last molt it will turn into a white alien-like pupa. It has no mouth or anus so does not eat. It does have leg and wing buds, but they do not function. The pupa is quite helpless and the only movement it can do is wiggle. This stage of life will last one to three weeks as the pupa transforms its organs and body into an adult.

Adult
The final stage of the insect’s life is as the darkling beetle and lasts one to three months. The beetle will be white with a soft exoskeleton. As the outer shell hardens, it will turn brown and then black. The beetle does have hard wings, but it is unable to fly.

After about one to two weeks of adult life, beetles will begin to mate and reproduce. A few days after mating, female beetles will burrow into soil or substrate and lay eggs. Darkling beetles are prolific breeders and females can lay hundreds of eggs during their adult lives.
8 0
4 years ago
Why are humans primarily eating at all leaves of the food chain?
asambeis [7]

Answer: Well we eat almost every herbivore, carnivore, and omnivore that can be easily obtained or commonly found, the reason I say this is because these animals eat the leaves. We also eat leaves in salads.

Explanation:

4 0
3 years ago
Disinfection of water is achieved by all of the following except
maks197457 [2]

Answer:

Option 5, Peracetic acid

Explanation:

Options

  1. Chlorine
  2. Copper sulphate
  3. UV radiation
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Solution

Peracetic acid is used as a cleanser and disinfectant in food industry and not in water and wastewater treatment plants.  

Chlorine is one of the commonly used disinfectants across the globe and one of the benefits of chlorine is that it also has residual disinfectant properties. UV however stronger than chlorine as disinfectant does not have residual disinfectant properties. Copper sulphate is a disinfectant used to kill fungi and algae and ozone is used to kill bacteria and viruses.  

Hence, option 5 is correct

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A the movement or organisms or their genetic material from one population to another

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3 years ago
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