What happens during an allergic reaction?
A) Immune cells attack the body's healthy cells.
B) The body mounts an immune reaction to a harmless substance.
C) Substances that were previously harmless become pathogenic.
D) The immune system overreacts to a mild pathogen.
B
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Phospholipase is an enzyme that will cleave the phosphate head group off a phospholipid molecule. The plasma membrane is not, however, permeable to the enzyme
Imagine a cell containing different phospholipids. How could you use phospholipase to determine which phospholipids are in the monolayer facing the exterior of the cell, and which are in the monolayer facing the interior (assume you have a way to assay for the different types of phospholipids)? What will be an ideal response?
A tariff is a
a. tax on exports. b. penalty imposed on exporters who export a greater quantity than the quota allows. c. penalty imposed on importers who import a greater quantity than the quota allows. d. tax on imports.
The type of connection between the atoms at the point labeled 1 in Figure 3-3 is:
a. a peptide bond. b. a glycoside linkage. c. a disulfide bond. d. a phosphodiester linkage. e. a hydrogen bond.
The cell wall of bacteria constrains the ________ ________ that results from the osmolarity of the cytoplasmic contents.
Fill in the blank(s) with the appropriate word(s).