The earliest nucleic acid was probably a simple DNA molecule
Indicate whether the statement is true or false.
Answer: FALSE
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Which of the following events represses the expression of the bacteriophage ? cI gene?
A. activation of PRE by cII protein B. Cro protein binding to the OR3 operator C. multiple viral particles infecting a single cell D. cIII protein protecting cII from proteolysis
The adrenal medulla produces:
a. aldosterone b. epinephrine c. cortisol d. testosterone e. both aldosterone and cortisol
Which sequence of events is required for the brain to interpret sound?I.Vibration of the basilar membrane relative to the tectorial membrane causes cilia on hair cells to bend and triggers depolarization.II.Hair cells stimulate the production of action potentials in sensory neurons that project to the brain.III.Ganglion cell axons transmit action potentials to the occipital lobe.
A. II then I B. III then I then II C. I then II D. III then I E. I then II then III
The pores that facilitate gas exchange in plant leaves are called
A) stomata. B) guard cells. C) vacuoles. D) plasmodesmata.