If a biochemist discovers a new molecule, which of the following pieces of data would allow her to draw the conclusion that the molecule is a steroid hormone? I) The molecule is lipid soluble
II) The molecule is derived from a series of steps beginning with cholesterol. III) The molecule acts at a target tissue some distance from where it is produced. IV) The molecule uses a carrier protein when in an aqueous solution such as blood. A) only I and III
B) only II and IV
C) only I, III, and IV
D) I, II, III, and IV
D
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Match the cell adhesion or junction on the left with the appropriate choice on the right.
A) protein subunits associated with gap junctions B) a type of adhesive junction connecting an epithelial cell to the basal lamina C) collection of fibrous intracellular attachment proteins D) create a permeability barrier E) button-like points of strong adhesion between two cells F) hollow cylinders associated with gap junctions G) type of adherens junction connecting cells with the extracellular matrix H) intermediate filaments associated with plaques I) collection of adherens junctions particularly associated with epithelial cells J) type of adhesive junction containing actin microfilaments K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms L) point of cytoplasmic contact between two cells M) anchors cytoskeleton of one cell with that of a neighboring cell 1) adherens junction 2) desmosome 3) cell junctions 4) connexons 5) plaque 6) tonofilaments 7) hemidesmosomes 8) adhesion belt 9) adhesive junction 10) tight junctions 11) connexin 12) gap junction 13) focal contact
Specific cells in developing seeds and maturing fruits have receptors for ethylene, but cells in stems generally do not
a. True b. False
Systematists strive to organize taxa that represent monophyletic groups
Indicate whether the statement is true or false.
You sprain your ankle at a roller derby practice. How would you treat your injury?
A) Use ice only because it will reduce swelling and increase blood flow to aid healing. B) Just leave it alone. Ice and heat both make the injury worse. C) First use ice to reduce swelling, and then use heat much later to aid healing. D) First use heat to aid healing, and use ice later to reduce swelling.