Neurotransmitters affect postsynaptic cells by _____. I) initiating signal transduction pathways in the cells II) causing molecular changes in the cells III) affecting ion-channel proteins IV) altering the permeability of the cells
A) I and III
B) II and IV
C) III and IV
D) I, II, III, and IV
D
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Certain plants may form tissues called ________ when their roots are flooded, whereas other plants may always form these tissue types.
A. parenchyma B. collenchyma C. sclerenchyma D. aerenchyma E. None of the choices is correct
The matrix is to the mitochondrion as the ________ is to the chloroplast
Fill in the blank with correct word.
Beta diversity, or turnover, would be at its minimum if all species occurred in all habitats within a region. Beta diversity would be at its maximum if each habitat had a unique biota, and regional diversity would equal:
A) the mean of the local diversities of all the habitats within the region. B) the sum of the local diversities of all the habitats within the region. C) the largest among the local diversities of all the habitats within the region. D) the smallest among the local diversities of all the habitats within the region.
Which parts of the atoms interact in a chemical reaction?
A. protons B. neutrons C. ions D. electrons E. isotopes