The shape of the lens of the eye can be changed to allow focusing on certain objects at different distances from the head. The structure that produces this shape change is the ________
A) ciliary body B) papillary muscle C) extrinsic muscle D) eyelid muscle
Answer: A
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Which of the following radiate from the centre of the cell and anchor the ER, Golgi complex, lysosomes, and secretory vesicles in place?
a. microfilaments b. microtubules c. actins d. laminins
The high surface tension of water that allows some insects to literally walk on water is because of:
A. polar covalent bonds B. high heat of vaporization C. cohesion D. heat storage E. adhesion
What is the evolutionary advantage of the very long life span of some plants?
A) the ability to adapt to changing environments B) the ability to develop resistance to many diseases C) the ability to produce many offspring over many years D) the ability to grow back after being damaged
The amphibians' unique contribution to the evolution of land vertebrates was
A. respiration through the skin. B. development of the tail for propulsion. C. respiration by gills. D. separation of lung/gill and systemic (body) circulation. E. the leathery waterproof egg shell.