Cells that line your intestines are specialized for nutrient absorbtion and are known to possess numerous membrane proteins that transport small molecules and ions across the plasma membrane

As part of their function, membrane-bound organelles, such as mitochondria and the en- doplasmic reticulum, must move substances across their membranes. Which of the following statements best describes a feature shared by mitochondria and the endoplasmic reticulum that increases the efficiency of their functions? A B с D double membranes, in which one membrane encloses the other rigid and nonfluid membranes membranes composed of carbohydrates highly folded membranes

Xena eventually catches Callisto (remember, she is 25 years old). Salmoneus, who is 60 years old, agrees to deliver Callisto to face charges for war crimes. On the way, their cart crashes down a ravine.  Salmoneus dies. When a cell dies its plasma membrane becomes “leaky”; i.e., it becomes permeable to ions that were unable to freely cross the membrane during life. Thus, after death, calcium ions leak across the sarcolemma of muscle fibers. This calcium leak causes rigor mortis, a temporary stiffness of the muscles after death. Apply your understanding of the mechanism of skeletal muscle contraction (specifically regarding events within muscle fibre) and explain the molecular basis of the phenomenon known as rigor mortis.

The non polar portion of the plasma membrane are composed of:     phosphate headgroups     phosphate tails     fatty acid headgroups     fatty acid tails