?
Figure 33.10 (part 2)
Use the accompanying figure to answer the following question.
The bones that amplify sound reaching the eardrum are indicated by the letters ____.
A. A and B
B. A, B, and C
C. B and C
D. C and D
E. C, D, and F
Answer: B
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The cytoskeleton has several primary functions. The first and most obvious is that it acts as an interior skeleton that supports the rest of the cell. What is another function of the cytoskeleton?
A) It provides a communication network whereby chemo-electrical signals can be sent from one area of the cell to another. B) It creates a durable outer covering to increase the strength and rigidity of the cell. C) It provides a series of tracks along which vesicles can move throughout the cell. D) It connects one cell to another.
RNA is a multifaceted molecule and key component to the success of life. Which of the following statements about RNA is most accurate?
a. RNA is incapable of storing information, but it is vital in converting the information embedded in DNA to useful proteins. b. The world was most likely filled with DNA-life first, which evolved to produce RNA-life. c. There is no link between RNA and the possibility of it being a precursor to cellular life. d. It is possible that this complex molecule could have been a self-replicating system. e. RNA is an enzyme.
What event that occurred around 10,000 years ago led to genetic changes in wheat?
A) domestication of the wheat plant B) domestication of livestock C) invention of genetic engineering D) mass extinction of herbivores
Most of the ultraviolet radiation reaching the upper atmosphere is absorbed by
A. ozone. B. water vapor. C. nitrogen. D. carbon dioxide. E. CFCs.