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NikAS [45]
3 years ago
5

The motor cortex is part of the ________.

Biology
1 answer:
max2010maxim [7]3 years ago
8 0

The correct answer is A. Cerebrum

Explanation:

The motor cortex is an area of the cerebral cortex (outer layer of the cerebrum in the brain), this area is the one responsible for movements especially voluntary ones and including the movement of different parts of the body such as the limbs, the jaw, the tongue, the eyeballs, the neck, etc. Additionally, due to the complexity of the motor cortex, this is divided into three areas located in the same zone that include the primary motor cortex, the supplementary motor area, and the premotor cortex. According to this, it can be concluded the motor cortex is part of the cerebrum as it is located in the cerebral cortex which is part of it (cerebrum).

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Before starting the explanation in the amoeba sister video, they explain what DNA replication is. We can say that DNA, which in eukaryotic cells is located in the nucleus, contains all the genetic information of a being and its duplication process is important for cell growth, reproduction and repair.

<h3 /><h3>What is DNA replication?</h3>

A DNA molecule is made up of two strands that complement each other. For example, if we have an F and an F' strand, in the replication process the strands separate and are used as templates for the formation of complementary strands. Thus, the nucleotide sequence of F determines the sequence of a new F' strand, and F' indicates the composition of a new F strand.

<h3>DNA replication process</h3>

In the video of the amoebas sisters it is briefly explained that..

  1. DNA replication occurs in the 5' → 3' direction and the strands are separated by the action of enzymes, which break the bonds between the nitrogenous bases and unwind the strands, opening the double helix.
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  3. DNA is a double helix molecule and for its duplication to occur, the first step is to unpack this structure by the action of the DNA helicase enzyme. The helicase recognizes the origin of replication and works by breaking the hydrogen bonds in the nitrogenous bases A-T and C-G. This process occurs at several points and forms "replication bubbles".
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  5. The primase enzyme is responsible for synthesizing a portion of RNA, called a primer. In this step, several primers are generated and are joined to the chain to start DNA synthesis.
  6. The DNA polymerase enzyme is the replication enzyme responsible for extending the new strand by adding the bases (A, C, G and T). This step is directed from the 5' end, with a phosphate group, to the 3' end, with a hydroxyl group. This phase is called continuous replication.
  7. Among the primers attached to the original strand, several pieces of DNA are attached and are called Okazaki fragments. As the sections will need to be joined later, this phase is called delayed.
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thus, in a simple way, how DNA replication occurs in the video of the amoebas sisters.

learn more about DNA in brainly.com/question/264225?referrer=searchResults

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