The tip region of the photoreceptor cells are removed by cells of the retinal pigment epithelium by ________.
A. phagocytosis
B. opsin
C. apoptosis
D. the bleaching reaction
Answer: A
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__________ break down food in the digestive tract
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Choose the correct order of the cell layers, or strata, in a section of thick skin, from the basement membrane toward the free surface (deep to superficial).1. stratum lucidum 2. stratum basale 3. stratum corneum 4. stratum granulosum 5. stratum spinosum
A) 3, 5, 4, 1, 2 B) 3, 4, 1, 5, 2 C) 2, 1, 4, 5, 3 D) 2, 4, 5, 3, 1 E) 2, 5, 4, 1, 3
The citric acid cycle begins by combining
A. oxaloacetic acid and acetyl-CoA to form citric acid. B. pyruvate and acetic acid to form acetoacetic acid. C. carbon dioxide and water to form carbonic acid. D. pyruvate and citric acid. E. pyruvate and carbon dioxide to form lactate.