Biological chemistry

Question 1

Relative electronegativities for most biologically important atoms

Answer 1

O > N > C ~ H

Question 2

Polar bond

Answer 2

Electrons not shared equally between two atoms

• polar molecules are hydrophilic
• more reactive, less PE, less strong (polar covalent bonds)

Question 3

Nonpolar bond

Answer 3

Electrons shared equally between two atoms

• nonpolar molecules are hydrophobic
• these bonds contain the highest PE (nonpolar covalent bonds)

Question 4

Chemical bond strength:

Answer 4

nonpolar covalent > polar covalent > ionic > hydrophobic > H-bonds > Van der Waal

Question 5

Peptide bond

Answer 5

C – N bond

formed when the carboxyl group of one molecule reacts with the amino group of the other molecule

Question 6

Hydrogen bond

Answer 6

Attractive force between the H attached to an electronegative atom of one molecule and an electronegative atom of a different molecule. H has the partial positive charge

Question 7

Covalent bond

Answer 7

A chemical bond that involves the sharing of electron pairs between atoms