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Ahat [919]
3 years ago
11

What is the purpose of the circulatory system?

Biology
1 answer:
AveGali [126]3 years ago
8 0
The main function of the circulatory system is to move materials throughout the body, blood for cellular respiration, sugars for energy, leukocytes for immune support, and other nutrients necessary for proper homeostasis.
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Which statements about the modification of chromatin structure in eukaryotes are true? Select all that apply. View Available Hin
Kay [80]

The correct answers are:  

  • Methylation of histone tails in chromatin can promote condensation of the chromatin.
  • DNA is not transcribed when chromatin is packaged tightly in a condensed form.
  • Acetylation of histone tails is a reversible process.
  • Some forms of chromatin modification can be passed on to future generations of cells.  
  • Acetylation of histone tails in chromatin allows access to DNA for transcription.

Histone modifications are post-translational modifications of histone protein that can affect gene expression by altering chromatin structure or recruiting histone modifiers.The most common modifications are methylation, phosphorylation, acetylation and ubiquitylation. All of them affect the binding affinity between histones and DNA and thus loosening (gene activation) or tightening (gene repression) the condensed DNA.

Histone methylation is a transfer of methyl group by histone methyltransferases to lysine or arginine amino acid of protein. Effect of methylation depends on the type of protein that is modified. Demethylation is the reverse process.

Histone acetylation is the process of adding of an acetyl group(by  histone acetyltransferases) to histone proteins and it can also activate or inhibit the gene expression. Deacetilation is reverse process.

7 0
3 years ago
With reference to the diagrams below, describe how fishes and bottom dwelling polychaete worms cope with the fluctuating salinit
klasskru [66]

Fishes and bottom dwelling worms cope with the fluctuating salinity within estuaries over the tidal cycle with the use of transport system such as active and passive transport.

<h3>How active and passive transport system are used?</h3>

In salty water, fish and other marine organisms used active transport in which energy is used to remove salts from the body of these marine organisms because excess salts are harmful for them.

So we can conclude that Fishes use transport system such as active and passive transport to cope with the fluctuation of salt concentration.

Learn more about salinity here: brainly.com/question/20283396

#SPJ1

6 0
2 years ago
Who proposed the polynucleic model, stating that DNA and RNA were composed of nucleotides.
Paraphin [41]
LeveneChargaffWatson and CrickNirenberg and Matthaei
4 0
2 years ago
What is the energy molecule in the thylakoid cell called ?
maria [59]
Your answer would be photosynthesis because photosynthesis synthesis  carbon based energy molecules from chloroplast inside a cell, with the outer membrance.

hope i helped my fellow brainily user :)
4 0
3 years ago
Select the following that are examples of technology in science. Check all that apply.
Pepsi [2]
We need to see our answer choices to check all that apply.
5 0
3 years ago
Read 2 more answers
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