Which of the following is not a subcellular structure?
A) intercellular material
B) membranes
C) cytoplasm
D) organelles
A) intercellular material
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Three factors that increase the rates of enzyme-controlled reactions are the
A) number of enzyme and substrate molecules formed and strength of the enzyme. B) number of enzyme molecules, number of substrate molecules, and efficiency of the enzyme. C) temperature of the reaction, number of H2O molecules, and bond strength. D) size of the enzyme compared to the substrate, the number of active sites, and the ratio of enzyme to substrate molecules.
The first law of thermodynamics states that once energy is consumed, it can no longer be converted to any other form of energy.
Answer the following statement true (T) or false (F)
A thick, sticky secretion produced by goblet cells is called
A. plasma. B. serous fluid. C. saliva. D. mucus. E. synovial fluid.
In the formation of the thyroid hormones, 90% of the secreted thyroid hormone is _____, while _____ is the thyroid hormone that affects target cells.
a. thyroxine; T4 b. T4; T3 c. thyroglobulin; T3 d. T3; T4 e. thyroxine; thyroglobulin