A specimen from a patient suffering diarrhea shows a one-celled organism in the microscope. The organism moves very slowly by protruding its cytoplasm. You would predict that the patient has an infection caused by ________.
A. Toxoplasma
B. Entamoeba
C. Plasmodium
D. Trichomonas
E. Giardia
Answer: B
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Which one of the following would be found in the cells of a blade of grass but not in the cells of an insect feeding on that grass? Select all correct choices
What will be an ideal response?
The advantage to a species of using a pheromone for communication rather than calling or gesturing is that it _____
a. conveys more information b. is more easily understood c. is more energy efficient d. is more variable e. conveys immediate information
In automated DNA sequencing, eventually there will
be millions of DNA fragments all tagged at a. one end. b. both ends. c. every nucleotide. d. the most numerous nucleotide. e. the least numerous nucleotide.
A(n) __________________ is a heritable trait that aids in the survival and reproduction of an organism in its present environment
A. Homologous structure B. Analogous structure C. Adaption D. Mutation