In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?
A) a tenth as much
B) half as much
C) twice as much
D) ten times as much
Answer: D
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The event called the Cambrian Explosion resulted in an abrupt increase in
A. geological activity. B. diversity of major animal groups. C. algal diversity. D. the number of days in the year. E. the amount of fish, of a single species, in the seas.
Which of the following statements regarding fecal transplant is correct?
A. The goal is to completely eradicate Clostridium difficile from a patient's gut microbiota and replace it with a healthy community. B. Fecal matter must be carefully disinfected and screened for viruses, cysts, and endospores before transfer to a recipient patient. C. Donors and recipients must be carefully matched to prevent an immune reaction in the recipient. D. This treatment is designed to jump-start the intestinal microbiota after an infection with Clostridium difficile resuts in acute diarrhea.
The letter "A" in the above figure represents
a. pericycle b. endodermis c. primary xylem d. root cortex e. primary phloem
Amino acid and vitamin supplements are prepared from extracts of microbial cultures
Indicate whether the statement is true or false