Which sequence accurately reflects the order in which light passes through the structures of the eye during vision?
A) pupil, cornea, lens, retina
B) pupil, lens, cornea, retina
C) cornea, lens, pupil, retina
D) cornea, pupil, lens, retina
Answer: D) cornea, pupil, lens, retina
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Do only plants have vacuoles?
A. Yes, only plants cells have vacuoles. B. No, bacteria also contain vacuoles that serve the same function C. No, other organisms, such as certain types of fungi and protists, have vacuoles that serve different functions. D. No, other organisms, such as certain types of fungi and protists, have vacuoles that serve the same function as in plant cells.
Which of the following could explain how 14 genes for globins, each specialized in their function (i.e., hemoglobin, myoglobin), arose in the genome?
A. misaligned crossover B. gene deletion C. gene mutation D. misaligned crossover and gene mutation E. misaligned crossover and gene deletion
Pepsin is an enzyme that functions in the stomach. Its optimum pH would be ____
a. between 1 and 2 b. between 3 and 4 c. above 6 d. between 5 and 7.5 e. above 8.5
Plants evolved from green algae approximately _____ million years ago.
a) 400 b) 3,500 c) 2,200 d) 130 e) 475