BIOB10 Lecture 3 Part 1

How would linking of an energetically favorable reaction (B → C) to an unfavorable reaction (A → B) allow conversion of A into B?

• Linking the reactions changes the rate of conversion of A into B.

• Linking the reactions changes the equilibrium constant for A → B.

• Linking the reactions changes energy constant for the unfavorable reaction.

• Linking the reactions changes the concentration ratio of [B]/[A].

Which of the following reactions will occur only if coupled to a second, energetically favorable reaction?

• 1, 2 and 3

• 2 and 3

• 1 and 3

• 1 and 2

Protein structures are defined by how many different levels of organization?

• 4

• 2

• 3

• 5

What is the primary structure (1º) of a protein?

• The overall 3D shape of the protein

• The specific sequence of amino acids

• The arrangement of multiple protein subunits

• The folding of the polypeptide chain

How many variations of proteins are possible with 20 amino acids and n amino acids in the chain?

• 20*n

• n!

A typical protein is over how many amino acids long?

• 100

• 10

• 25

• 50

What is removed during the formation of a peptide bond between two amino acids, as shown in the diagram?

• Oxygen

• Water

• Carbon dioxide

• Hydrogen

What determines the primary structure of a protein?

• The sequence of the gene encoding the protein (DNA)

• The shape of the protein

• The function of the protein

• The environment of the protein

The sequence of a protein contains most of the information needed to specify the 3-D shape and function of the protein.

• True

• False

What is the abbreviation for Histidine?

• His

• Gly

• Ala

• Phe