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Zanzabum
3 years ago
11

What is the difference between active & passive transport?

Biology
1 answer:
siniylev [52]3 years ago
4 0

Answer:

An active transport requires energy, a passive transport does not.

That's all! Hope that helps :)

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True or false? One possible way to alter chromatin structure such that genes could be transcribed would be to make histone prote
Dmitrij [34]

Answer:

False

Explanation:

The histones that are more positively charged, tight hardly to negatively charged DNA. So, enzymes, such as acetyltransferases, that reduce the positive charge of histones promote transcription.

Chromatin structure and its modifications can change the package of the DNA and consequently, alter the gene expression. The most common modifications of the chromatin are covalent modifications such as acetylation/deacetylation (by acetyltransferases and eacetylases), methylation (by methyltransferases), and phosphorylation (by kinases).  This is the way of gene expression regulation.

The effects of modifications are different, for example methylation promotes  condensation of the chromatin and as a consequence, prevents binding of transcription factors to the DNA (transcription is repressed).

Acetylation loosens the association between nucleosomes and DNA (because it neutralizes the positive charge of histones) and consequently promotes transcription. Deacetylation is a process opposite to acetylation.

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3 years ago
SOMEONE PLEASE HELP ME??
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GenaCL600 [577]

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How many times are you gonna ask? Imao

Explanation: when I’m in my room and no one is around to drown out my own noise, that’s when I feel the most lonely.

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Answer:

Energy transferred during a chemical reaction. ... In an exothermic reaction, the potential energy of the system goes down, and heat is given out. In an endothermic reaction, the potential energy of the system goes up, and heat is taken in.

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