Your instructor wants your lab time to be as septic as posssible
a. true
b. false
Ans: b. false
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Based on the fossil record, which of the following structures likely evolved first as plants made the transition to land?
A. leaves B. branches C. roots D. flowers
The conversion of proteins by the removal of a
portion of polypeptide chain is an example of a. transcriptional control. b. transcript processing control. c. transport control. d. translational control. e. post-translational control
Each of the following contributes to the unidirectional propagation of nerve signals except
A) dendrites only receive signals. B) presynaptic neurotransmitter secretion is separated from postsynaptic receptors. C) neuron membranes have a refractory period following generation of an action potential. D) ion channels are oriented to transport ions only into the neuron. E) action potentials initiate the hillock and propagate only down the axon.
If the hypothesis that protocells were based on an "RNA world" is correct, what would be necessary to shift to a "DNA world"?
A. an enzyme or reaction capable of removing one oxygen from ribose in nucleotides B. new enzymes for transcribing DNA back to RNA C. enzymes for reverse transcription of RNA into DNA D. new enzymes to replicate the DNA E. All would be necessary to switch to a "DNA world."