During which stage of mitosis do replicated chromosomes condense and the nuclear envelope disappear?
A. telophase
B. metaphase
C. anaphase
D. interphase
E. prophase
Answer: E
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Which of the following statements about nitrogenous waste excretion is correct?
A. Uric acid is less toxic than ammonia, but more energetically costly to produce. B. Ammonia is more toxic than urea, but requires less water for excretion. C. Urea is less toxic than uric acid, but more energetically costly to produce. D. Uric acid is less toxic than urea, but requires more water for excretion. E. Ammonia is less toxic than uric acid, but requires more water for excretion.
Which of the following is most important for retaining water in soil for use by plants?
a. sand b. humus c. clay d. silt e. rock
Unlike energy, matter cycles. This means that
A) chemical elements are continually cycled within ecosystems. B) chemicals can store energy for later use. C) once a chemical element is put in the system it does not change forms or react with other elements. D) All of these. E) A and B
The part(s) of a neuron that receive(s) signals is/are the ____________.
A) dendrites B) axon hillock C) axon D) nucleus E) All parts of a neuron receive signals.