In muscle contraction, the breaking of the
cross-bridge between actin and myosin is
caused by___.
a. hydrolysis of ATP into ADP plus Pi
b. formation of ATP from ADP and Pi
c. release of Pi from the myosin head
d. binding of a new ATP to the myosin head
e. return of myosin to a high-energy state
D
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____ are phagocytes that engulf bacteria and cellular debris
a. Eosinophils b. Leucocytes c. Monocytes d. Platelets e. Neutrophils
All of the following can contribute to
desertification EXCEPT a. drought. b. overplowing. c. overgrazing. d. natural fertilizer. e. All of these can contribute to desertification
Consider the following two chemical equations:A
glucose + fructose ? sucrose + H2O, ?G = +27kJ/mole (or +6.5 kcal/mole) B. glucose + fructose + ATP ? sucrose + ADP + Pi, ?G = ?5kJ/mole (or ?1.2 kcal/mole) The free energy change difference between the chemical equations (A) and (B) above is accomplished by: a. a decrease in activation energy. b. combining two endergonic reactions. c. combining an endergonic and an exergonic reaction. d. combining two exergonic reactions. e. measuring the reaction rate.
The smooth endoplasmic reticulum functions in synthesis of ________.
A. nucleic acids B. glucose C. glycogen D. proteins E. lipids