The biological species concept cannot be used to distinguish between species that are extant
Indicate whether the statement is true or false.
ANS: F, extinct
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Which of the following molecules inhibits bacterial transcription by prevention of promoter clearance?
A. ?-amanitin B. actinomycin D C. rifampicin D. acridine E. ethidium bromide
What happens when the membrane potential of a neuron reaches the threshold level?
a. Voltage-gated sodium channels open, and sodium diffuses out of the cell. b. Voltage-gated potassium channels open for a very brief period. c. Voltage-gated sodium channels close, so sodium cannot diffuse out of the cell. d. The sodium channel protein changes its shape to open the gates of the channel. e. The membrane potential is more negative than when at rest.
The term "kindling" refers to:
A) the experimental induction of seizures using subthreshold stimuli B) an experimental procedure for blocking the spread of seizures C) application of massive depolarizing stimuli to a brain region D) the net effect of integrating postsynaptic potentials at the axon hillock
Mitochondria originated from proteobacteria.
Answer the following statement true (T) or false (F)