EPSP is a process of activating postsynaptic neuron by (i) ________ of the membrane that is accompanied by (ii) ___ influx.
a) (i) depolarization, (ii) Na+
b) (i) hyperpolarization, (ii) Na+
c) (i) depolarization, (ii) Cl-
d) (i) hyperpolarization, (ii) Cl-
Answer: a) (i) depolarization, (ii) Na+
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Two 6-base sequences are present in bacterial promoters: TATAAT (located 10 nt upstream from the start site) and TTGACA (located 35 nt upstream from the start site). What is the significance of the fact that these two base sequences are different?
A. Binding sites for both the holoenzyme and ATP are provided. B. Both the location of the start site and the direction of transcription can be established. C. Binding sites for both the core polymerase and holoenzyme are provided. D. The transcription bubble can be properly formed. E. It allows RNA polymerase to distinguish between the template strand and the coding strand of the DNA molecule.
Chemotaxis is a process by which bacteria
A. respond metabolically to the presence of autoinducer molecules. B. avoid phagocytosis. C. move on solid surfaces by means of type IV fimbriae. D. move toward an attractant or away from a repellent.
What is true of a fossil that is classified as a "transitional form"?
A. It has all of the traits of its ancestors and all of the traits of its descendants. B. It has all of the traits of its ancestors and some of the traits of its descendants. C. It has some of the traits of its ancestors and all of the traits of its descendants. D. It has some of the traits of its ancestors and some of the traits of its descendants.
How many genes are generally found for every million bases of prokaryotic DNA?
A. 10 B. 1,000 C. 100 D. 10,000 E. 100,000