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Sladkaya [172]
3 years ago
12

By the end of the preschool period, the brain structure called the __________ becomes considerably thicker, with individual fibe

rs that help coordinate brain functioning between the two hemispheres. hypothalamus cerebral cortex corpus callosum frontal lobe
Biology
1 answer:
sweet [91]3 years ago
8 0

Answer : Corpus Callosum


Explanation : By the end of the preschool period, the brain structure called the <u>Corpus Callosum </u> becomes considerably thicker, with individual fibers that helps to co-ordinate brain functioning between the two hemispheres.


Corpus Callosum by definition is a thick band of nerve fibers that divides the cerebral cortex lobes into left and right hemispheres in the brain, which connects the left and right sides of the brain allowing for communication between both hemispheres.

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Keeping the organelles inside of the cell and giving the cell structure.

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The urinary system removes excess substances and waste products from the metabolism from the body through the urine, contributing to the maintenance of homeostasis, the chemical composition of the internal environment. Urine is produced in the kidneys, passes through the ureters to the bladder, where it is stored and is released into the exterior through the urethra.

The kidneys perform the main work of the urinary system comparing with the other parts of the system, acting primarily as passageways and storage areas. With the filtration of blood and the formation of urine, the kidneys contribute to homeostasis of body fluids in a number of ways, such as: Regulation of the ionic composition of blood; Maintenance of blood osmolarity; Regulation of blood volume; Blood pressure regulation; PH regulation of blood; Hormone release; Regulation of blood glucose level; Waste excretion and toxic substances.

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3 years ago
describe three traits that might be desired in sheep. How can these traits be passed on to the next generation? Explain.
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Answer:

1. They grow faster.

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3. They are disease free.

This trait can be passed from one generation to another in that by breeding and inbreeding.

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They have deeply entrenched place in human culture.

Sheep is associated with pastoral and arcadian imagery. They were used as sacrificial animals in ancient religious.

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When DNA is compacted by histones into 10-nm and 30-nm fibers, the DNA is unable to interact with proteins required for gene exp
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Answer:

This is through the process of methylation and phosphorylation of histones tails.

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The addition of   a methyl group  to the amino acid of the histones of the  nucleosomes   that compacted DNA  in the nucleus is  called mehtylation, while the addtion of phodpahte is phosphorylation

Its  effects  on  gene expression depends on the number of <u> methyl groups, and type of amino acid that  methylated. During transcription. </u>

<u />

The DNA double strands are compacted and therefore  hidden  from transcription factors and enzymes of transcription by the hitones  tails of the neuclosomes, Methylation  weaken the binding bonds between the tails and DNA structure ; thereby aiding the uncoiling of DNA  from the  tails.(nucleosomes).This chemical  reaction  aided  DNA  strands  exposure   to transcription factors and enzymes, for initiation of transcription. This explains the dyanmic activity of methylation

Futhermore phophorylation also favours unwrapping of DNA, by imitating   modifying enzymes e.g H3Y41E and H3T45E  and convert it to→→ H3Y41phopspahte to aid DNA unwrapping and accessibility to  transcription factors and RNA polymerase Enzymes,

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