How can two cells of a complex multicellular organism have the same genome, but markedly different structures and functions?
A. During differentiation, as cells become
specialized, they lose portions of their
genome that are no longer needed.
B. Different genes are expressed in different
cells.
C. Part of the process of differentiation of
cells involves mutations in the genome.
D. Once differentiation begins, the genome
no longer controls cellular functions.
B
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Which of the following is not true of phospholipids?
A) Phospholipids are important in membrane structure. B) Serine is a molecule that may be part of a phosphoglyceride. C) Phosphatidic acid contains two fatty acids and a phosphate group. D) Sphingolipids are the predominant phospholipid in membranes. E) Phospholipids are amphipathic.
Histamine ____
a. causes blood vessels to contract b. causes capillaries to lose their permeability c. causes an outward flow of fluids from the capillaries d. reduces tissue swelling e. causes cells to release interferons
When the atria are filled and the AV valves are open, blood flows directly into ________
a. the aorta b. the pulmonary circuit c. the systemic circuit d. both ventricles
New membrane phospholipids are synthesized by enzymes bound to the _____________ side of the _________________ membrane
(a) cytosolic, mitochondrial (b) luminal, Golgi (c) cytosolic, endoplasmic reticulum (d) extracellular, plasma