Parkinson's disease is caused by decreased dopamine release in the ______, the part of the brain responsible for _____________.
Fill in the blank(s) with the appropriate word(s).
Ans: basal nuclei, suppression of useless movement patterns
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The enzyme that has the ability to synthesize DNA from ribonucleic acid (RNA) is called:
a. DNA polymerase. b. RNAse. c. helicase. d. reverse transcriptase.
Cellular differentiation depends on which genes are turned on or expressed in the cell
Indicate whether the statement is true or false
What is a relationship called between two types of organisms in which one benefits while the other remains unaffected?
A. Amensalism B. Commensalism C. Mutualism D. Parasitism
Silicon is an element that, like carbon, has four vacancies in its outer electron shell and therefore has the same bonding chemistry as carbon. Silicon is not found to any significant degree in the molecules found in living systems, however
Does this difference arise because elemental carbon is more abundant than silicon? What other explanations are there for the preferential selection of carbon over silicon as the basis for the molecules of life?