Which of the following correctly lists organization levels from the simplest to the most complex?
a. atoms, organelles, cells, tissues, organs
b. atoms, molecules, tissues, organelles, organisms
c. molecules, atoms, cells, organelles, tissues
d. molecules, cells, organelles, organisms, organs
a. atoms, organelles, cells, tissues, organs
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Chloroplasts and mitochondria originated from ________ by a process known as ________
A) bacteria / chromosome reduction B) plants / gene deletion C) bacteria / endosymbiosis D) plants / endosymbiosis
How many times better is the resolution of the transmission electron microscope than the resolution of the scanning electron microscope?
A) 100 B) 1,000 C) 10,000 D) 100,000
In multiple sclerosis, autoantibodies attack
A. acetylcholine receptors on smooth muscle. B. sodium pump proteins in the cell membrane. C. myelin sheath cells of the nervous system. D. acetylcholine receptors on skeletal muscle. E. cells in thyroid follicles.
What was the probable role of oxygen gas in the early stages of life's appearance on Earth?
A) Cellular respiration, which depends on oxygen availability, provided abundant energy to the first life-forms. B) Oxygen promoted the formation of complex organic molecules through physical processes. C) Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth. D) Abundant atmospheric oxygen would have created an ozone layer, which would have blocked out ultraviolet light and thereby protected the earliest life-forms.