What accounts for the majority of mass within a biomass pyramid of a lake?
a. plants
b. snakes
c. invertebrates
d. small fish
e. large-mouth bass
ANSWER: a
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Cardiac muscle cells have gap junctions between adjacent cells. What is the function of those gap junctions?
A. They maintain isotonic conditions. B. They facilitate cell-cell adhesion. C. They are involved in cell-cell communication of the cells of the heart. D. They make nutrients, like glucose, readily available to the muscle cells of the entire heart.
Saltatory conduction is a term applied to the "jumping" movement of action potentials
A. across electrical synapses. B. along the postsynaptic membrane from dendrite to axon hillock. C. in two directions at the same time. D. from one neuron to another. E. along myelinated axons.
When the RNA primers are removed from the 5' ends of eukaryotic chromosomes after replication, DNA polymerase is unable to fill in the gaps. What prevents the chromosomes from getting shorter and shorter with each round of replication?
What will be an ideal response?
A change in allele frequencies due to random chance is termed ________.
a) natural selection b) genetic equilibrium c) genetic drift d) gene flow