Answer:
Covalent bonds form when two atoms share valence electrons,
while Van der Waals forces cause an attraction between nonpolar
molecules
Explanation:
A covalent bond is said to be formed when two atoms of the same or different elements share electrons. In an ordinary covalent bond, each bonding atom contributes one valence electron while in a dative covalent bond only one of the bonding atoms provides the shared pair of electrons.
Van Der Waals forces is the major intermolecular interaction between non polar compounds. Van Der Waals forces " are caused by correlations in the fluctuating polarizations of nearby particles"(Wikipedia).
Answer:
The basic repeating unit of nucleic acids are known as nucleotides. A nucleotide consists of three distinct chemical groups, a 5-carbon sugar (ribose or deoxyribose), a nitrogen-rich base - (cytosine (C), guanine (G), adenine (A), thymine (T) in DNA or uracil (U) instead of T (in RNA), and phosphate.
Hello!
There are two possible answers to this. The one I'm assuming you're looking for is hydrogen bonds.
Hydrogen bonds are the bonds which hold together the double helix shape of DNA. These bonds result from a positive and negative charge drawing two molecules closer to each other. These bonds are generally seen as weak, however, since there are so many of these bonds (as there are so many nitrogenous bases in one strand of DNA), the double helix strand is fairly strong.
Hope this helps!
- Translated from Portuguese language:
"The word atom has a Greek origin, meaning indivisible. Why was this term chosen to describe the particles that form matter? Is the atom really indivisible?".
Answer:
- An atom is termed as the basic unit for generating or creation of the different complex structures, as they are characterized by the different shapes and properties due to position or alignment of the different number of atoms inside the given parameters or are of the object.
- It was a belief in the early times that atom is not divisible further in to small sub atomic parts, this concept was improved by the experiments of the cathode ray tube etc.
Explanation:
- However, the atom is comprised of the following subatomic particles which are as follows:
- The nucleus is comprised of the protons(positrons) and neutrons.
- While, the outer region or the cloud is comprised of the electrons inside the different shells and orbits.
Chromosome are found inside the Nucleus of a cell!
:) your answer is D.
