Which of the following is NOT an exclusive criterion for eusociality?
a. reproductive division of labor
b. division of labor
c. cooperative rearing
d. overlapping generations
e. B and D
E
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Class I biological safety cabinets:
a. sterilize the air as it passes over the ma-terial in the cabinet. b. protect the environment from contamina-tion by biological agents by filtering the air as it is exhausted from the cabinet. c. are completely enclosed and have gloves that enable the worker to manipulate the material in the cabinet. d. are often called laminar flow hoods.
The pigment most involved with photoperiodism is ____
a. chlorophyll b. xanthophyll c. anthocyanin d. phytochrome e. phytoerythrin
Which structure begins protein digestion under acidic conditions?
a. mouth b. stomach c. small intestines d. large intestines e. liver
In 1884, Elie Metchnikoff observed blood cells collected around a splinter inserted in a sea star embryo. This was the discovery of
a. blood cells. b. sea stars. c. phagocytosis. d. immunity. e. none of the above