Which is an example of a clumped distribution of a population?
A. A tree species releases a poison to defend the soil around its roots, resulting in trees spaced evenly like a grid.
B. Antelope travel in herds.
C. Two male hummingbirds have a confrontation on the border between their territories.
D. Multiple species join each other at the waterhole to drink.
B. Antelope travel in herds.
Social interactions between members of a species can lead to clumped distributions. Many species live and move around in large groups (such as flocks, herds, or prides). These groupings can provide many advantages, including defense against predators, decreased energy cost of moving through air and water, and access to the knowledge of all group members.
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Properties of effective antigens include all of the following except
A. they are large molecules with a minimum molecular weight of 1,000. B. they have molecular complexity. C. they are foreign to the immune system. D. they are cells or large, complex molecules. E. they are large polymers made up of repeating subunits.
In the Ames test, gene mutation restores the ability of a bacterium to synthesize
A) epidermal growth factor. B) histidine. C) a polycyclic aromatic hydrocarbon. D) a T lymphocyte inhibitor. E) a DNA repair enzyme.
Mushrooms with gills have meiotically produced spores located in or on
a) zygosporangia. b) basidia. c) asci. d) conidiophores. e) soredia.
Two important contributions that cleavage makes to development are to
A) establish the basic tissues of the body and define the future nervous system. B) create a multicellular embryo and partition the embryo into developmental regions. C) create a multicellular embryo and establish the basic tissues of the body. D) establish the basic body plan and determine the location of the mouth and anus.