When impulses are conducted through the heart, transmission is delayed at the __________ so that the
__________ may contract before the __________.
a. sinoatrial node; atria; ventricles
b. sinoatrial node; ventricles; atria
c. atrioventricular bundle; atria; ventricles
d. atrioventricular node; ventricles; atria
e. atrioventricular node; atria; ventricles
E
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Agrobacterium infects plants and causes them to form tumors. You are asked to determine how long a plant must be exposed to these bacteria to become infected. Which of the following experiments will provide the best data to address that question?
A) Determine the survival rate of Agrobacterium when exposed to different concentrations of an antibiotic. B) Measure the number of tumors formed on a plant when exposed to various concentrations of Agrobacterium. C) Measure the concentration of Agrobacterium in different soil environments where the plants grow. D) Measure the number of tumors formed on plants, which are exposed to Agrobacterium for different lengths of time.
All atoms tend to fill their outer energy levels with the maximum number of electrons, usually eight. Depending on whether atoms satisfy the octet rule will predict:
A. the chemical behavior of the atoms. B. whether they will be found in nature. C. whether they will dissolve in water. D. their radioactive energy.
The competitive exclusion principle assumes that the competing species have exactly the same resource requirements
Indicate whether the statement is true or false
T or F: Movement is a change in place, position, or posture occuring over time
What will be an ideal response?