In a nucleotide, the sugar is bonded to a
A. sugar.
B. codon.
C. salt.
D. base and phosphate.
D. base and phosphate.
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What effect does the nervous system have on the heart rate?
A. Stimulation by parasympathetic nerves causes the heart rate to slow down. B. Stimulation by sympathetic nerves sets the resting heart rate of the pacemaker cells in the SA node. C. Stimulation by sympathetic nerves causes the pacemaker cells of the AV node to depolarize more rapidly than the pacemaker cells of the SA node. D. Stimulation by either the sympathetic or parasympathetic nerves causes pacemaker cells in the SA node to depolarize more slowly. E. The nervous system does not directly affect the heart rate.
If thyroid hormone levels are very high in the blood, what hormone level would be low in the blood?
a. parathyroid hormone (PTH) b. calcitonin c. thyroid-stimulating hormone (TSH) d. inhibin e. cortisol
Phosphofructokinase is stimulated by high levels of ATP
__________________ Indicate whether the statement is true or false.
In an atom with a neutral overall charge, the number of protons is equal to the ________.
A. number of electrons minus the number of neutrons B. atomic mass C. number of electrons plus the number of neutrons D. number of electrons