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Viefleur [7K]
3 years ago
9

When DNA is replicated, it is necessary for the two strands to "unzip" temporarily. Choose which bonding type is most appropriat

e for holding the strands together in this way.
A) ionic bonding
B) hydrogen bonding
C) non-polar covalent bonding D) polar covalent bonding
Chemistry
1 answer:
wariber [46]3 years ago
5 0

Answer: B) hydrogen bonding

Explanation:

A) An ionic bond is formed when an element completely transfers its valence electron to another element.

B) Hydrogen bonds are special type of dipole dipole forces which are formed when hydrogen bonds with an electronegative element.

DNA strands are held together by hydrogen bonds between the bases on one strand and those on the other. Adenine and thymine have two hydrogen bonds between them while cytosine and guanine have three hydrogen bonds between them.

C) Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms.

D) A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.

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tresset_1 [31]

Answer: False

Explanation: The chemical hazard label indicates the class of harzard of chemical products. It appears on their Safety Data Sheet (SDS), which contains a lot of informations about these substances.

The chemical hazard label is divided into four colors and which one has a meaning (categorie) connected with a number, like:

Blue: Health hazard - If the chemical is deadly (4), extreme danger (3), hazardous (2), slightly hazardous (1) or a normal material (0).

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3 years ago
What's is the difference between relative abundance vs percent abundance
guajiro [1.7K]
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The key difference is that percentages are standardised as a number out of 100 which allows you to compare them with other percentages without any calculations.

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The answer would just be:
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