Question

Please answer both, I'll give a good review :-)

1. Energy is extracted from food because:

a) catabolism builds up complex molecules from simple precursors

b) carbon-hydrogen bonds become oxidized

c) carbon dioxide goes into the atmosphere and causes global warming

d) carbon-carbon bonds become reduced

2. Glucose uptake by mammalian cells

a) occurs normally in diabetics

b) only happens during the daytime

c) requires the oxidation of NADH to NAD+

d) is facilitated by dedicated glucose transport proteins

Answer 1

Ans 1. B

The complete oxidation of glucose involves four phases.

1. Glycolysis, the splitting of glucose into two 3-carbon molecules

2. The preparatory reaction, which divides each 3-carbon molecule into a 2-carbon molecule and CO2

3. The citric acid or Krebs cycle, which produces CO2, NADH, FADH2, and ATP

4. The electron transport chain also known as the electron transport system, assists in the production of the largest amount of ATP

Ans 2. D

Glucose is a key metabolic substrate for mammalian cells. ... The first step in the metabolism of blood glucose is transport across the plasma membrane. This step is carried out by a family of membrane carrier proteins called glucose transporters.