Which statement about the focusing of light by the eyes is true?
A) Squids and many fishes change the shape of their lenses to focus light.
B) Mammals focus light when a rigid lens is moved back and forth.
C) Mammals use muscles and ligaments to change the shape of their lenses to focus light.
D) Mammalian lenses thicken when focused on distant objects.
Answer: C
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Which of the following organisms can produce pheromones? Select all correct answers
A. dogs B. orchids C. fish D. ants E. birds
Alexander Oparin hypothesized that living cells evolved from coacervates. What was the "boundary" material of the coacervates Oparin made, and how does this boundary differ from present day liposome membranes?
A. Oparin used a phospholipid bilayer to build the coacervates, it is the same as the bilayer found in present day liposomes. B. Oparin's coacervates were surrounded by a tight skin of water molecules, the same as present day liposomes. C. Oparin's coacervates were surrounded by carbohydrates and lipids, unlike present day liposomes which have a carbohydrate membrane only. D. Oparin's coacervates were surrounded by a tight skin of water molecules; present day liposomes have a phospholipid bilayer for their membrane. E. Starch was the main component in Oparin's coacervate boundry; liposomes also use mainly carbohydrates for their membrane.
In Drosophila, the sequential order of the function of segmentation genes is ________
A) pair-rule, transdeterminal, gap B) gap, segment-polarity, pair-rule C) gap, pair-rule, segment-polarity D) transdeterminal, gap, pair-rule E) segmentational, helical, spherical
________ is caused by an interference with the blood supply to the brain.
A. Angina pectoris B. A stroke C. Arteriosclerosis D. Atherosclerosis