List two characteristics that have contributed to the biological success of the insects, and briefly
explain the adaptive value of each characteristic that you identified. What will be an ideal response?
Exoskeleton: protection against predators and water loss
Segmentation: allows mobility and permits specialization of segments
Jointed appendages: can be specialized for locomotion and feeding
Ability to fly: facilitate wide distribution and survival
High reproductive capacity including metamorphosis: survival of the species
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What category of proteins facilitates the movement of ions and molecules across membranes?
A. regulatory proteins B. protective proteins C. transport proteins D. cell-signaling proteins E. motor proteins
Milk production in women is stimulated by
a. estrogen. b. prolactin. c. oxytocin. d. prostaglandin. e. progesterone.
Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Propose a chemical basis for this change from a liquid to a solid.
A. Hydrogenation of fats changes them from unsaturated to saturated, which are more solid. B. Trans-fatty acid are changed from saturated to unsaturated, allowing them to solidify. C. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify. D. Hydrogenation of fats changes them from saturated to unsaturated, which are more solid.
Protection from infection known as species resistance is a result of
A. the lack of suitable environment in the body. B. the absence of receptors required for microbial attachment. C. the presence of phagocytes in the tissues. D. the salty, acidic condition of normal skin. E. both the absence of necessary receptors and lack of suitable environment in the body.