Exam #3

Question 1

In competitive inhibition, an inhibitor …

Answer 1

Binds reversibly at the active site

Question 2

From the perspective of a cell receiving a message, the three stages of cell signaling are

Answer 2

signal reception –> signal transduction –> cellular response

Question 3

Membrane receptors that attach phosphates to specific amino acids in proteins are

Answer 3

called receptor tyrosine-kinases

Question 4

Which of the following correctly states an essential step in the function of heterotrimeric G protein function

Answer 4

Binding of a hormone to a receptor must signal the exchange of GDP to GTP

Question 5

In general, a signal transmitted via phosphorylation of a series of proteins

Answer 5

Brings a conformational change to each protein

Question 6

In allosteric regulation, an enzyme is regulated by a molecule binding to…

Answer 6

• A binding site in the catalytic domain distinct from the active site
• A regulatory domain

Question 7

To calculate the catalytic efficiency of an enzyme, you need to know:

Answer 7

• The turnover number

- the Km of the substrate

Question 8

During glycolysis, the steps between glucose and the formation of glyceraldehyde-3-phospate consumes …

Answer 8

2 ATP molecules

Question 9

V0 =

Answer 9

k2 [ES]

Question 10

Vmax =

Answer 10

k2 [E]t