A fed-batch reactor containing 2 litre of medium and 0.1 g.l^-l of biomass is fed with a medium containing 1 g.l^-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l^-1, then the biomass produced during the 10 hour period is

#Question id: 1122

#Section 3: Genetics, Cellular and Molecular Biology

In endocrine signaling, the signaling molecule.

#Question id: 1123

#Section 3: Genetics, Cellular and Molecular Biology

Epinephrine can be what kind of signaling molecule?

a. autocrine      b. direct contact  c. endocrine d. paracrine

#Question id: 1124

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following is (are) intracellular second messengers?

a. Ca2+                        b. cAMP          c. epinephrine             

d. protein kinase A      e. protein kinase C

#Question id: 1125

#Section 3: Genetics, Cellular and Molecular Biology

Examples of G protein–coupled receptors include

a. rhodopsin receptor.             b. β-adrenergic receptor.

c. insulin receptor.                   d. acetylcholine receptor.

#Question id: 1126

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following statement(s) is (are) true of the α subunit of a G protein?

a. It physically associates with the receptor.              

b. It binds GDP.

c. It binds GTP.                     

d. It is a transmembrane protein.

#Question id: 1127

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following steps does not occur after acetylcholine binds to the muscarinic acetylcholine receptor in heart muscle cells?