The maximum density is 4 degrees Celsius :)
Answer: It is not healthy.
Explanation:
Wearing a hat shields your eyes from the sun, which can cause your retinas to burn, this is why sunglasses are also recommended, it helps stop too much light from entering your eyes, as well as UV rays.
Wearing sunscreen can protect your skin from harmful sun rays. These harmful sun rays can cause skin cancer by putting a protective layer over the skin.
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Answer:
Option A
Explanation:
The flower cells are hypertonic to fresh water but hypotonic to the salt solution.
Flower cell is hypertonic to fresh water, this means that the amount of solute in the solution outside the flower cell is higher than the solute content inside the flower cell.
While when a flower cell is hypotonic, it means that the amount of solute in the solution outside the flower cell is lower than the solute content inside the flower cell.
This is the reason why a flower plant placed in vase of water stood and become erect, while the same flower placed in a salt solution wilted.
Hence, option A is correct
Answer:
EtBr inserts between the stacked bases in the DNA double helix.
Explanation:
- EtBr is used for visualizing DNA bands as it fluoresces under the UV illumination.
- EtBr is an aromatic compound that is capable of inserting itself between the stacked bases of the DNA double helix.
- The hydrophobic environment around the base pairs where the EtBr intercalates is responsible for the fluorescence. As the EtBr molecule intercalates between these base pairs the cation of EtBr sheds the water molecules associated with it and this causes it to fluoresce under UV light as water is a quencher of fluorescence.
