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charle [14.2K]
3 years ago
12

1.) What is the most important source of energy that our body craves more than any other?

Biology
2 answers:
Masja [62]3 years ago
7 0
1.food is the most important thing in our bodies
I am Lyosha [343]3 years ago
3 0
<span>1.) What is the most important source of energy that our body craves more than any other? 
Glucose is a type of sugar you would find in healthy fruits and vegetables. The body needs this to be active and full of energy. It starts as glucose, then gets turned into ATP.


2.) What are the organelles in each cell that burn this energy? 
Mitochondria, and cytoplasm.</span>
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_____ is the study of living or once-living things. This includes the human body.
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The study of the lives of early human communities through the examination of their physical remains. Objects made by humans that are unearthed by archaeologists. ... The study of the earth, especially it's rock forms.

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The imaging technique that provides the greatest contrast between brain tissues of different densities is:
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<span>Magnetic resonance imaging is a technology that uses magnetic fields and radio waves to produce high quality 2 or 3 dimensional images of the brain structure without using radioactive tracers and ionizing radiation. The magnetic resonance intensity is proportional to the density of the protons in various tissues.</span>

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Pcr is used to amplify a segment of dna and the enzyme responsible for the replication of dna is
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What is binomial nomenclature? <br>​
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Answer:

In taxonomy, binomial nomenclature ("two-term naming system"), also called binominal nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, although they can be based on words from other languages. Such a name is called a binomial name (which may be shortened to just "binomial"), a binomen, binominal name or a scientific name; more informally it is also called a Latin name.

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Read 2 more answers
The retinoblastoma protein, pRB, is a tumor-suppressor protein that controls the G1/S cell-cycle checkpoint. While pRB is presen
gladu [14]

Answer:

1. pRB phosphorylated: The cell will not remain in G1 phase i.e. it will enter S phase because pRB will be degraded.

2. pRB not phosphorylated: The cell will remain in G1 phase i.e. will not enter S phase because pRB will remain bound to E2F.

3. pRB bound to E2F: The cell will remain in G1 phase i.e. will not enter S phase.

4. pRB not bound to E2F: The cell will not remain in G1 phase i.e. it will enter S phase.

5. E2F bound to DNA: The cell will not remain in G1 phase i.e. it will enter S phase.

6. CDK4 bound to Cyclin D1:  The cell will not remain in G1 phase i.e. it will enter S phase.

Explanation:

Retinoblastoma protein, pRB supresses tumor by regulating cell cycle progression in G1 phase. When a transcription factor known as E2F is bound to pRB the cell remains in G1 phase and did not proceed further to enter S phase. But as soon as pRB becomes phosphorylated, E2F becomes free and causes gene expression of cyclin E and and cyclin A which are required in progression of cell cycle from G1 phase to S phase.

<u>Signaling involved in cell cycle progression from G1 phase to S phase. </u>

When a cell is unstimulated, pRB is bound to E2F but G1 phase specific growth factors induce the expression of cyclin D through Ras-MAP kinase pathway.

Synthesis of cyclin D leads to the activation of CDK-4 which is a serine-threonine kinase. This kinase causes phosphorylation of pRB which results in the degradation of pRB.

Because of degradation of pRB, <u>E2F becomes free</u> and leads to the expression of cyclin E and and cyclin A which are S phase specific cyclins. This is how cell progresses from G1 phase to S phase.

E2F is a transcription factor which causes expression of S phase specific cyclins i.e. cyclin E and and cyclin A. So, E2F bound to DNA will result in cell cycle progression from G1 phase to S phase.

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3 years ago
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