Question

Which of the following normally occurs in a muscle cell whether or not oxygen is present?
a)citric acid cycle
b)fermentation
c)glycolysis
d)chemiosmosis

Answer 1

b. lactic acid fermentation

Answer 2

Lactic acid fermentation? I know what lactic acid is, but lactic acid fermentation? I'd have to go with glycolysis.

Answer 3

Glycolysis it is

Answer 4

Resting skeletal muscle fibers rely almost exclusively on the aerobic metabolism of fatty acids to generate ATP. When the muscle starts contracting, the mitochondria begin breaking down molecules of pyruvic acid instead of fatty acids. The pyruvic acid is provided by the enzymatic pathway of glycolysis.

Glycolysis Glycolysis is the breakdown of glucose to pyruvic acid in the cytoplasm of a cell. It is called an anaerobic process, because it does not require oxygen. Glycolysis provides a net gain of 2 ATP and generates 2 pyruvic acid molecules from each glucose molecule. The ATP produced by glycolysis is thus only a small fraction of that produced by aerobic metabolism, in which the breakdown of the 2 pyruvic acid molecules in mitochondria would generate 34 ATP. Yet, because it can proceed in the absence of oxygen, glycolysis can be important when the availability of oxygen limits the rate of mitochondrial ATP production...
http://cwx.prenhall.com/bookbind/pubbooks/martinidemo/chapter10/medialib/CH10/html/ch10_5_2.html

Answer 5

ah, I see. "normally" occurs.