Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems?
A) Many primary and higher-order consumers are opportunistic feeders.
B) Decomposers compete with higher-order consumers for nutrients and energy.
C) Nutrient cycles involve both abiotic and biotic components of ecosystems.
D) Nutrient cycling rates tend to be limited by decomposition.
E) Energy transfer between trophic levels is usually less than 20 percent efficient.
Answer: E
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Enzymes needed to digest all types of macromolecules are found in
A. centrioles. B. Golgi apparatus. C. mitochondria. D. lysosomes.
All proteins are enzymes.
Answer the following statement true (T) or false (F)
Select the correct sequence of animal developmental events
a. fertilization >>> cleavage >>> organ formation >>>gastrula b. fertilization >>> cleavage >>> gastrula >>> organ formation c. fertilization >>> gastrula >>> cleavage >>> organ formation d. fertilization >>> organ formation >>> gastrula >>> cleavage e. fertilization >>> organ formation >>> cleavage >>> gastrula
Which of the following is not an enzyme released from the pancreas?
a. trypsin. b. chymotrypsin. c. pancreatic lipase. d. maltase. e. ribonuclease.