Proteins

Question 1

A molecule bound reversibly by a protein

Answer 1

ligand

Question 2

A ligand binds at a site on the protein called _______

Answer 2

binding site

Question 3

poorly soluble in aqueous solutions and cannot be carried to tissues in sufficient quantity if it is simply dissolved in blood serum.

Answer 3

oxygen

Question 4

non-polypeptide group which is required for protein conformation and biological activity

Answer 4

prosthetic group

Question 5

oxidized and reduced heme group

Answer 5

cytochrome

Question 6

catalyzes the breakdown of H₂O₂

Answer 6

Catalase

Question 7

reversibly bind oxygen

Answer 7

hemoglobin and myoglobin

Question 8

a heme protein present in heart and skeletal muscle

Answer 8

myoglobin

contains eight stretches of alpha-helix

Question 9

Found in RBCs, and transports oxygen. Two alpha chains and two beta chains. It can carry four molecules of O₂

Answer 9

Hemoglobin

The oxygen-binding properties of hemeglobin are regulated by interaction with allosteric effectors.

Question 10

normal ligand and modulator are identical

Answer 10

homotropic

Question 11

the modulator is a moleule other than the liagand

Answer 11

heterotropic

Question 13

inversely related to the binding of oxygen

Answer 13

H+ and CO2

Question 14

Oxygen binding to hemoglobin is regulated by

Answer 14

2,3-bisphosphoglycerate

Question 15

Hemoglobin is an ______+++++++++++++++++++ tetramer that changes conformation from a T state to R state upon binding oxygen