Answer:
Explanation:
Heterochromatin in terms of accessible of the cell's machinery is termed as the region whereby the nucleosomes are tightly packed toghether such that the cell's transcriptional machinery is unable to access this regions. Examples of regions where this is found is at the centromeres, the telomeres and some other few regions in the chromosomes.
Euchromatin in terms of accessibility is the region wherein the nucleosomes are loosely packed such that the cellular processes machines is able to get access to the DNA.
The cell makes DNA in highly compatible state accessible by understood some epigenetic mechanisms such as modification of the histone tails. An example is acetylation; this allows addition of an acetyl group to specific regions on the tail of particular histones that allows for the unwrapping of the history from the DNA making them accessible. This is carried out by some enzymes known as histone acetyltransferases (HATs). Another example is phosphorylation: this does the same as acetylation.
Answer:
Double circulatory system
Explanation:
I do not see any diagram, so forgive me if I am wrong, but if we are talking about the circulatory system of a human, that is a double circulatory system.
Gene mutations can be passed on to future generations and drive natural selection. ... Gene mutations can be helpful, harmful, or neutral for an organism's survival. Only mutations that are helpful in the organism's environment would influence its survival and reproduction
Answer:
B
Explanation:
to mantain the homeostasis of the organisms water content
Answer:
<h3>Definition</h3>
Multicellular organisms are organisms which are composed of more than one cell, with groups of cells differentiating to take on specialized functions. For example: human cells, plant cells, fungal cells (except yeast) and cells of protoctist such as plasmodium.
<h3>Characteristics</h3>
- Made of more than one cell and are complex organisms.
- Visible to the eye.
- Possess distinct organs and organ systems.
- They are eukaryotes (contain nucleus) cells.
- Their cells exhibit division of labour.
- Size increases with the number of cells in an organism.