A diafiltration process is used to remove salts from a protein solution of 1L. After 1L of make-up buffer (without salts) has been added to this system, the residual salt concentration would be of the original.

TLS Online TPP Program

#Question id: 55

#Unit 1. Structure and Function of Biomolecules

The standard free energy change for the reaction A → B is −15.0 kJ · mol−1. What is the equilibrium constant for the reaction at 25°C?

TLS Online TPP Program

#Question id: 56

#Unit 1. Structure and Function of Biomolecules

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?

TLS Online TPP Program

#Question id: 57

#Unit 1. Structure and Function of Biomolecules

A(n) ________ has charge but negligible mass, whereas a(n) ________ has mass but no charge.

TLS Online TPP Program

#Question id: 58

#Unit 1. Structure and Function of Biomolecules

A covalent chemical bond is one in which ________.

TLS Online TPP Program

#Question id: 59

#Unit 1. Structure and Function of Biomolecules

Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?

TLS Online TPP Program

#Question id: 60

#Unit 1. Structure and Function of Biomolecules

Which of the following is true for the reaction?

3H₂ + N₂   2NH₃