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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Which of the following pairs is correctly matched?
A. broad ligaments - help support the uterus B. cervix - lined with rugae C. basal layer - layer of endometrium closest to uterine cavity D. perimetrium - muscular coat of uterus E. endometrium - connective tissue layer
Two species of antelope ground squirrels are separated by the Grand Canyon. They are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. If this hypothesis is correct, it would be an example of:
A. allopatric speciation by dispersal. B. allopatric speciation by vicariance. C. peripatric speciation by vicariance. D. sympatric speciation by dispersal. E. sympatric speciation by vicariance.
Atoms with atomic numbers between lithium and neon have two energy levels
Indicate whether the statement is true or false.
Which of the following techniques was used to produce Dolly, the first mammal to be cloned?
a. trangenic modification b. transformation c. enucleation d. fermentation