A certain species of animal represents just 3% of the biomass in its ecosystem. We might classify this as a keystone species if its removal
A) allowed an even rarer species to increase in number and take its place.
B) had no effect on the community.
C) caused 2% of the other species in the community to disappear.
D) caused plant biomass to increase by 5%.
E) caused the diversity of the plant community to decline by 40%.
E
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The innermost whorl of a flower typically consists of one or more
a. petals. b. carpels. c. stamens. d. receptacles. e. sepals.
Both pulse-field gel electrophoresis and Western blotting utilize electrophoresis in their procedures. When comparing the two procedures, which statement is true?
A. Pulse-field gel electrophoresis is excellent for identifying minute genetic differences among strains of one species of an organism. B. Pulse-field gel electrophoresis separates DNA fragments while Western blotting separates proteins. C. The presence of antibodies in a patient specimen can be identified in the Western Blot. D. Pulse-field gel electrophoresis is used for genetic analysis. E. All of the statements are true.
In Prokaryote genetics, Transduction can be defined as the:
A. Use of a bacteriophage (bacterial virus) to transfer DNA between cells. B. Naked DNA is taken up from the environment by bacterial cells. C. The correct answer is not listed. D. Direct transfer of DNA from one bacterial cell to another.
What is the maximum number of electrons in the second energy shell of an atom?
A. 2 B. 8 C. 32 D. 4 E. 18