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Activity A (continued from previous page)
5. Observe: Click on the muscle fiber to see a close-up. Note that each muscle fiber consists of
a bundle of still smaller rod-like structures known as myofibrils, which are striated (banded).
A. What are the dark bands made of?

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

What are two examples of conduction that we use everyday

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are