Question

question 33
2.5 points
a covalent bond is formed by.
a the donation of an electron from one atom to another.
b the acceptance of an electron from one atom to another.
c both donation and acceptance of an electron between atoms.
d the sharing of electrons between atoms.
e a weak interaction between two atom’s electrons.

question 34
2.5 points
nucleotides are composed of.
a sugar, phosphate group, and a base.
b sugar, amino acid, and a base.
c lipid, phosphate group, and base.
d ribose, phosphate group, and an amino acid.
e deoxyribose, lipid, and a base.

Explanation:

Question 33

To determine how a covalent bond is formed, we recall the definition of a covalent bond. Ionic bonds involve electron donation/acceptance (transfer), while covalent bonds involve atoms sharing electrons. Option A and B describe electron transfer (ionic bond behavior). Option C also implies transfer. Option E describes a weak interaction, not a covalent bond. Option D correctly states that covalent bonds form via electron sharing between atoms.

Nucleotides are the building blocks of nucleic acids (DNA, RNA). The structure of a nucleotide consists of three components: a pentose sugar (deoxyribose in DNA, ribose in RNA), a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, thymine/uracil). Option A matches this structure. Option B includes amino acids (for proteins), Option C includes lipids (not in nucleotides), Option D includes amino acids, and Option E includes lipids. So Option A is correct.

Answer:

D. the sharing of electrons between atoms.

Question 34