All enzymes are which type of organic molecule?
a. lipids
b. minerals
c. carbohydrates
d. vitamins
e. proteins
ANSWER: e
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Lipids that form membranes have what kind of structure?
A) completely nonpolar, because they are lipids B) completely polar, which allows them to dissolve in water C) polar heads and nonpolar tails; the nonpolar tails interact with water D) polar heads and nonpolar tails; the polar heads interact with water
Which is true about superantigens?
A. They are a type of exotoxin. B. They bind to MHC class II antigen on T cells. C. They enhance specific antibody production. D. They are processed intracellularly. E. They are a type of exotoxin AND they bind to MHC class II antigen on T cells.
The sliding filament model of muscle contraction depends on the dynamic interactions between muscle
and sarcomere proteins.
Indicate whether the statement is true or false.Although all of the cells in your body contain a complete set of DNA, different types of cells arise because__________.
a) different genes are switched on and off in each type of cell b) the contain different chromosomes c) they contain different genes d) none of the above