The body wall of cnidarians and ctenophores consist of:
A. three tissue layers.
B. a single epidermal layer.
C. loosely organized cells.
D. two epidermal layers with scattered mesophyll cells in between.
E. inner and outer cell layers separated by a jelly-like mesoglea.
E
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Enzymes are
a. protein catalysts. b. lipid catalysts. c. nucleic acid catalysts. d. inorganic catalysts. e. ionic catalysts.
Photochrome is the pigment responsible for
a. thigmotropism. b. phototropism. c. gravitropism d. photoperiodism. e. senescence
During ____, microtubules fasten the cell’s chromosomes to the spindle poles
a. prophase I b. anaphase II c. metaphase I d. metaphase II e. telophase I
Gene probes can be labeled for detection with reporter molecules such as ________.
A. radioisotopes B. fluorescent dyes C. enzymes D. All of the choices above can be used.