Which cellular component directs the movement of vesicles from the soma to the axon terminal?

How does the digesive sysytem maintain homestats?

BigorU [14]

The complex mechanism that maintains homeostasis is believed to depend on the immune system of the intestine.

4 0

3 years ago

What is the function of the layer of dead keratinocytes on the top of the epidermis?

Alexxx [7]

Answer:

<h2>Function as Waterproofing and works as a barrier to infection. </h2>

Explanation:

1. Keratinocytes are maintained at various stages of differentiation in the epidermis.

2. Keratinocytes are responsible for forming tight junctions with the nerves of the skin.

3. The outer layer of skin, the epidermis containing keratinocytes, which provides waterproofing and serves as a barrier to infection.

4. It is barrier to foreign particles and provide physical strength.

5. It helps in innate immune system.

5 0

3 years ago

Which of the following statements describes the structure of the plasma membrane?

mixer [17]

Answer:

is a lipid bilayer with the hydrophobic area pointing inward, and the hydrophilic area facing outward

3 0

3 years ago

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A student is developing a model that shows the steps of protein synthesis. The model should include activities in which three st

Stella [2.4K]

A because in protein synthesis you need proteins and ribosomes make proteins

6 0

3 years ago

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Below is a mature eukaryotic mRNA transcript. Translate this mRNA into a protein, also showing the tRNA anticodons involved. Mak

diamong [38]

Answer:

mRNA ⇒ 5'GMU UAC AUG CGG CUC AGU UGA GGC GAA AAA A 3'

tRNA ⇒ UAC GCC GAG UCA ACU

protein ⇒ N - MET ARG LEU SER Stop - C

Explanation:

In protein synthesis, the ribosome reads mRNA in the 5´ to 3´ direction, and, according to the codons that are being readen, tRNA transfers the correct amino acids to build the polypeptide chain. A codon is a short sequence of three nucleotides that store the genetic information for the aminoacids´ assembly. Each tRNA has two important sites. One of them that couples with the codon of the mRNA molecule, named anticodon. The other site couples with an amino acid. tRNA allows amino acids to align according to the nucleotidic sequence in the mRNA molecule.

Once the new amino acid links to the growing peptidic chain, the binding between the amino acid and the tRNA molecule breaks. The tRNA is now free to join another amino acid and repeat the cycle.

The protein is synthesized from the amino terminus to the carboxy terminus, while the added amino acids to the chain are coded by a codon formed by three bases in the mRNA. mARNs also have a start and end codon that are the signals of the synthesis initiation and finish. When the ribosome reaches the end codon, protein synthesis is over.

Each of the codons represents one of the 20 amino acids used to build the protein. Each amino acid can be codified by more than one codon. From the total 64 codons, 61 codify amino acids, and one of them is a start codon. The left three codons are stopping translation points.

The codons indicating the initiation or stop points during the translation process are:

• The start codon AUG is the most common sequence used by eukaryotic cells and places near the 5´extreme of the molecule.

• The end codons are UAA, UAG, UGA.

Protein synthesis initiates in the AUG start codon -Metionin-, and ends when reaching either of the stop codons UAA, UAG, UGA.

In the exposed example we have the following mRNA.

mRNA ⇒ 5'GMU UAC AUG CGG CUC AGU UGA GGC GAA AAA A 3'

Codons are separated by a space left between them. AUG is the start codon placed near the 5´ extreme. UGA is the end codon near the 3´ extreme. tRNA will add amino acids from the start codon, not before.

tRNA ⇒ UAC GCC GAG UCA ACU

Anticodons are separated by a space left between them.

protein ⇒ N - MET ARG LEU SER Stop - C

Each mRNA codon codifies for an amino acid. The start codon codifies for methionine. AUG = Met, CGG = Arg, CUC = Leu, AGU = Ser, UGA = Stop codon. The amino terminus is represented as an N and the carboxy terminus is a C. The first extreme to be translated carries the amino-terminal group, while the other extreme carries the carboxy-terminus group.

5 0

3 years ago