1. A biologist discussing the discovery of horseshoe crab fossils that date to 4
ID: 86967 • Letter: 1
Question
1. A biologist discussing the discovery of horseshoe crab fossils that date to 445 mya mentions that these fossils were the ancestors of horseshoe crabs living today. Which biological principle does this illustrate? O The fundamental unit of life is the cell. O All living organisms are composed of cells. O Life is continuous. O Evolution explains the diversity of living organisms on Earth today. O All organisms on Earth share a common ancestor. 2. Refer to the figure below. Cell A Cell B 10um x 10um x 10um 30um x 30um x 30um The villi of the small intestine are lined with epithelial cells that absorb nutrients from digested food on one side and transfer these nutrients into the blood on the other side. Which cell shown in the figure would be most efficient as an epithelial cell in the intestinal villi, and why? O Cell A because it has a larger surface area-to-volume ratio than cell B. O Cell B because it has a larger overall size than cell A. O Cell B because it has a greater volume than cell A. O Cell A because its volume is greater than its surface area. O Cell B because it has a greater surface area than cell A.Explanation / Answer
1.
Ans. c) Life is continuous
2.Ans. a) Cell A because it has larger surface area than to volume ratio than cell B
3. Ans. b) Ratio of surface area to volume
4. Ans. a) Use scanning electron microscopy to search the protein in three dimensional surfaces of whole cells
5. Ans. c) cell membranes are selectively permeable with respect to molecules and ions.
6. Ans. b) search for the presence of membrane bound structures within the cell by transmission electron microcopy
7.Ans c) 7,2,6,3
8.Ans. e) Capsule
9. a) proteins in the cytosol would break down
10. a) Density
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