Answer:
To achieve precipitation of the DNA.
Explanation:
Isopropyl alcohol makes the DNA sediment. The DNA, once out of the solution, becomes visible, as it clumps.
The result of adding isopropyl alcohol is the precipitation or sedimentation of DNA when DNA becomes like a visible thread with the help of alcohol and salt. The precipitation of DNA is important because it removes the dirt from DNA.
Answer: Histones and DNA have opposite charges -True
Acetylation of histones cancels their positive charge- True
Acetylated histones are more attracted to DNA - False
Acetylation creates binding sites for remodeling engines and other factors- True
Explanation:
It is widely found that acetylation of lysines leads to transcriptional activation. The modifications of histones such as acetylation affect the affinity of the histone for interacting proteins that control the transcriptional activity of chromatin,
which has led to the concept of a histone code.The positive charge on the histones is removed by acetylation, hence they decrease the interaction of histones with the negatively charged phosphate groups of DNA. As a result, the highly condensed chromatin is now transformed to a more relaxed structure and thereby higher level of transcription are achieved
Answer:
The answer is C - Theories are supported with evidence and do explain what we see in the world (Ex: The cell theory) The evidence can change or be added on to when new evidence is found.
Explanation:
A - Theories are not hypotheses but theories start out as hypotheses. When the hypotheses gain enough evidence, they can start to become a theory, and this is after many experimentations and testings and trials and research.
B - Everyone can have theories, not just scientists. Many theories have been made on social media platforms such as r e d d i t or y o u t u b e. Some of these theories are conspiracy theories that people make based on some evidence they gather about a topic and sometimes believe is true even though it may not be true.
D - Theories are not opinions but are backed up with evidence and may have went through many trials and errors to become where it is.
E - Theories are testable ideas and scientists are always trying to make theories to be the best of what it can be. Theories have to be tested over and over again to make sure that whatever the theory is about is still valid and works.
I’m pretty sure it’s a. sorry if i’m wrong <3
