During electrical stimulation of the heart, the impulse pauses briefly at the ________ before continuing on to the ventricles
Fill in the blank(s) with correct word
atrioventricular node
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Which subatomic particle contains the positive charge?
a. Both the neutron and electron b. Neutron c. Proton d. Electron e. Both the proton and neutron
Deamination of amino acids in mammals yields amino groups that are converted to __________,
which is(are) excreted, and __________, which is(are) converted to one of the reactants of glycolysis or the citric acid cycle. a. urea; carbon chains b. amino acids; ATP c. amino groups; ADP d. carbon chains; amino acids e. amines; ATP
The ultimate source of energy for photosynthetic reactions in a plant is
A. plants. B. catabolism. C. the sun. D. glucose. E. glycogen.
In basidiomycetes, the ________ is diploid.
A. secondary mycelium B. zygote C. primary mycelium D. basidium