43. The fossils in a layer of rock are significandhy different from those in the

Question

43. The fossils in a layer of rock are significandhy different from those in the rock layer directly above it. One hypothesis to explain the difference s that a major extinction event occurred at the point in time represented by the transition between the two rock layers. 42. Which of the following best describes how myelination affects the transmission of nerve (A) It speeds up the transmission of impulses by (B) It speds up the transmission of impuses by (C) It slows down the transmission of impulses impulses? acting as an electrical insulasor Which of the following is the best plan for collecting data to use in a test of the hypothesist? integrating signal information more quickly by forming gaps of unsheathed axons (D) It slows down the transmission of impulses (A) Examining the upper part of the lower rock by impeding the movement of ions across the neuronal membrane. layer for evidence of a catastrophic event, sach as the presence of shocked quartz iridium, or soot particles (B) Digging farther into the hillside to look for a section of sedimentary rock that has a third layer below the two layers that were already dentified (C) Comparing the genomes of organisms from different evolutionary lineages to estimate the relative geologic age of the upper rock layer (D) Searching fossil collections in several museums for examples of the types of features once shared among organisms that

Explanation / Answer

42. Option A is correct. Myelination (covering of axon by myelin sheath) speed up the transmission of impulses because it works as insulator. It prevents the leak out of current from axon and thus increasing the distance along the axon that a given local current can flow passively.

43. Option C is correct. Comparison of genome (genetic material, DNA, RNA) gives specific and accurate information about the geologic age of rock layer because of significant changes in genomic pattern of organisms from different evolutionary lineages.

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