Which of the following is TRUE about the cholesterol associated with membranes?
a) it makes the cell membrane fluid at room temperature
b) it is oriented with the small hydroxyl group embedded in the lipid bilayer and the remainder of the molecule toward the membrane surface
c) it interferes with the movements of fatty acid tails of the phospholipids
d) all of the choices are correct
Ans: c) it interferes with the movements of fatty acid tails of the phospholipids
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The tertiary structure of a protein is the _____
A) bonding together of several polypeptide chains by weak bonds B) order in which amino acids are joined in a polypeptide chain C) unique three-dimensional shape of the fully folded polypeptide D) organization of a polypeptide chain into an ?-helix or ?-pleated sheet E) overall protein structure resulting from the aggregation of two or more polypeptide subunits
Homologous structures were "discovered" by findings that indicated that ____
a. species on different continents were not similar in form b. different geological layers held different kinds of fossils c. structures of similar form and position occurred in animals of markedly different size, shape, and lifestyle d. some structures found in animals are apparently useless e. some kinds of animals had apparently gone extinct
: A disease is considered communicable when the infectious agent can be transmitted from infected host to new host and establish infection in that host.
a. true b. false
Barr bodies are inactivated X chromosomes
Indicate whether the statement is true or false