Enzymes are proteins that increase the rate of chemical reactions by
A. increasing the activation energy of the reaction.
B. increasing the concentration of the reactants.
C. decreasing the activation energy of the reaction.
D. adjusting the temperature of the reaction.
C
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Emily, a 64-year-old obese woman, was brought to the hospital suffering pain in her legs, and an X ray revealed that she had a simple fracture in her right femur and a crack in her left tibia. Other tests revealed that her bones were brittle and porous. What might have happened to Emily, and what advice would she have been given by the physician?
What will be an ideal response?
Which is NOT a basic method of cell-to-cell communication?
A) mechanical signals B) cytoplasmic transfer of signals C) nerve and blood-transported signals D) contact-dependent signals E) diffused chemical signals
What cell gives rise to all formed elements?
A) proerythroblast B) hematopoietic stem cell (HSC) C) reticulocyte D) erythroblast
At rest, active sites on the actin are blocked by
A) myosin molecules. B) troponin molecules. C) tropomyosin molecules. D) calcium ions. E) ATP molecules.