Cells can regulate the rate of the TCA cycle using all the following ways, EXCEPT
A) Controlling the concentration of the substrate.
B) Controlling the concentration of the required enzyme.
C) Controlling the amount of energy the cell must expend for survival.
D) Controlling the catalytic activity of the required enzymes.
Answer: C
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Once threshold potential has been achieved, the permeability of the membrane to Na+ is
a. greater than it was at rest. b. greater than its permeability to K+. c. increased due to activation of voltage-gated Na+ channels. d. all of these. e. none of these.
The most prevalent of skeletal muscle fibers in the body are ________ fibers.
A. fast-twitch B. slow-twitch C. intermediate
An athlete participates in aerobic exercise three times a week. One of the changes is an increased ability to deliver oxygen to her skeletal muscles. Over time she notices that she can continue the exercise with greater intensity and duration. The reason for this change is that there is a(n)
a. greater response from phosphate transfer. b. greater production of ATP from glycolysis and less from aerobic cellular respiration. c. greater production of ATP from aerobic cellular respiration. d. increased production of lactate.
Intramembranous ossification is common in children, whereas endochondral ossification is typical in young adults
Indicate whether the statement is true or false