The TTL output stage is a rather complicated pushâpull circuit known as a totem-pole output (the transistors, diode, and resistor in the right-most slice of this TTL logic gate circuit). It sinks currents better than it sources current.
The theory for spontaneous generation refers to the idea that life can produced from nonliving things. Lazzaro Spallanzani proposed in his experiement that air was necessary for spontaneous generation.
This is the end of the preview. Sign up to access the rest of the document. Unformatted text preview: Chapter 014 - The Origin and History of Life Multiple Choice Questions 1. Which scientist, using meat placed in sealed containers and meat in open containers, helped disprove the theory of spontaneous generation? A. Louis Pasteur B. Lazzaro Spallanzani C. Charles Darwin D. Francesco Redi E. Svante Arrhenius 2.