Which of the following would prevent muscle contraction but is not a malfunction of the actual muscle fiber?
a. no signal from the nerves ever reaches the muscle cell membrane.
b. inability of an action potential to reach the sarcoplasmic reticulum.
c. calcium not entering the sarcomeres.
d. inability of troponin to twist around an actin strand.

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Which statements about the fluid mosaic structure of a membrane are correct? select the three correct statements.which statements about the fluid mosaic structure of a membrane are correct? select the three correct statements.the framework of a membrane is a bilayer of phospholipids with their hydrophilic heads facing the aqueous environment inside and outside of the cell and their hydrophobic tails clustered in the center.because membranes are fluid, membrane proteins and phospholipids can drift about in the membrane.the diverse proteins found in and attached to membranes perform many important functions.the kinky tails of some proteins keep the membrane fluid by preventing the component molecules from packing solidly together.membranes include a mosaic, or mix, of carbohydrates embedded in a phospholipid bilayer.

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously