From what substance do liposomes spontaneously form and why are they important?
a. Liposomes spontaneously form from DNA and proteins and provide a rigid structure to support the cell.
b. They are formed from phospholipid monolayers. These phospholipid monolayers provide a stable barrier between the internal and external environments.
c. Liposomes were the first rigid cell walls providing support for the living cell and a barrier between the external and internal environments.
d. Liposomes form from phospholipid bilayers and provide a barrier between an external environment and an internal environment; this creates an internal environment where specific chemical reactions needed to establish a living cell can occur separately from the external environment.
Ans: d. Liposomes form from phospholipid bilayers and provide a barrier between an external environment and an internal environment; this creates an internal environment where specific chemical reactions needed to establish a living cell can occur separately from the external environment.
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Four of the five answers listed below are aspects of the process known as gene splicing. Select the
exception. a. cloning vector b. restriction enzymes c. sticky ends d. exposed base pairs e. crossing over
A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. covalent bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the nonpolar end of the phospholipid molecule. E. hydrogen bonds with the polar end of the phospholipid molecule.
Where are hydrophobic interactions MOST likely to occur?
A) the core of a water-soluble protein B) in contact with water molecules C) on the surface of a water-soluble protein D) between two charged molecules E) between two ions
Urinalysis can be used to identify all of the following
EXCEPT a. a metabolic problem. b. a bacterial infection. c. kidney disease. d. diabetes insipidus. e. cardiac damage.