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gladu [14]
4 years ago
5

The assembly of a cyclin-dependent kinase complex (CDKCs) begins with association of a cyclin and a cyclin-dependent kinase CDK

that is than phosphorylated by a CDK-activating kinase and a CDK-inhibitory kinase and finally becomes active by dephosphorylation by a phosphatase. Why CDKCs involve such a complex multi-step activation mechanism?
Biology
1 answer:
schepotkina [342]4 years ago
5 0

Answer:

Cyclin-dependent kinase complex (CDKCs) are important in various cell functions; for example, they play a role in the regulation of the cell cycle, they are involved in the cell transcription, messenger RNA proccesing, and diferrentiation of different cell types. They are so important that a complex activation mechanism is neccesary to avoid cell problems for the accidental activation of CDKCs. This hard activation pathways are also common in other protein complex that are essential in the regulation of the cell, the DNA or RNA proccesing and other delicate functions.

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8 0
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The brain stem consists of the ________. The brain stem consists of the ________. cerebrum, pons, midbrain, and medulla midbrain
skelet666 [1.2K]

Answer:

midbrain, medulla, and pons

Explanation:

The brainstem (also known as truncus encephali) is localized in the posterior part of the brain, in the base between cerebral hemispheres and the cervical cord. <em>It's divided into three parts, the midbrain or mesencephalon, the pons or mesencephalon, and the medulla oblongata also known as long medulla or myelencephalon.</em> <em>In the image I added you can see the brainstem structure.</em>

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I hope you find this information useful and interesting! Good luck!

3 0
4 years ago
Why do the levels of GH-RH and CRH rise during the resistance phase of the general adaptation syndrome?
Alenkinab [10]

Answer:

During the resistance phase of the general adaptation syndrome, the human body undergoes a process of adaptation or tolerance to stress, which requires an increase in levels of growth hormone (GH) and cortisol, so it is observed rise the levels of GHRH and CRH.

Explanation:

General adaptive syndrome is a product of the stress to which an individual is subjected, causing a number of symptoms reflecting the loss of normal body balance, symptoms that can be both physical and psychological. This syndrome has three phases:

  • <em>Alarm phase. </em>
  • <em>Resistance phase. </em>
  • <em>Exhaustion phase. </em>

The second phase, resistance, is due to an <u>adaptation or tolerance when the stressful stimulus is maintained</u>. At this stage, an increase in blood levels of growth hormone and cortisol -which contribute to the stress tolerance process- is usually observed, increasing the bioavailability of blood glucose and endogenous steroids.

Both GHRH (somatocrin) and CRH (corticotropin-releasing hormone) are produced by the hypothalamus and activate the release of GH and adrenocorticopotrotrope hormone (CRH) by the pituitary gland, producing:

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  2. <em>Increased levels of cortisol, from the adrenal glands, in response to stress.  </em>

In the resistance phase of general adaptative syndrome, GHRH and CRH levels increase to regulate adaptive changes that occur in the body of the individual who has it.

Learn more:

Hormonal response brainly.com/question/6337416

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3 years ago
Which situation is an example of competition that would be found in the grassland?
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When two lions compete for the same habitat, shelter, and food
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Though it is possible that REM sleep and dreaming are not necessary in the adult, REM deprivation studies seem to suggest otherw
HACTEHA [7]

Answer:

Rapid eye movement sleep (REM) may be defined as the the phase of the sleep that are unique to the mammals. This sleep is marked by the muscle tone.  

The REM leads to the increase in pressure with deprivation.  This leads to the increase in the rapid eye movement and plays an important role in the REM sleep and dreaming of the individual and quite necessary in the adult.

7 0
4 years ago
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