Arnold was involved in a major traffic accident, and some of the nerves in his spinal cord were cut. What are his chances for a full recovery? Please explain your answer
What will be an ideal response?
The outlook is most likely poor because most neurons cannot divide, although there is some chance that future research with stem cells and nerve growth factors may help. Computers can stimulate the correct muscles to produce movements; with this type of assistance, people can now walk, whereas previously their mobility would have been limited or nonexistent.
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Crossing over normally takes place during which of the following processes?
A) meiosis II B) meiosis I C) mitosis D) mitosis and meiosis II
Plants produce more seeds when they reproduce asexually than sexually. Yet most plants reproduce sexually in nature. What is the probable explanation for the prevalence of sexual reproduction? Sexual reproduction _____
A) is more energy efficient than asexual reproduction B) ensures genetic continuity from parents to offspring C) mixes up alleles contributing to variation in a species D) is not dependent on other agents of pollination
Like DNA microarrays, Northern blots analyze the levels of mRNA. However, Northern blots are almost always prepared with a probe tagged with one label, whereas DNA microarrays almost always use two groups of probes, each one tagged with a different fluore
scent label. What is the advantage of using two labels for the microarray probes? The two labels _____. A) increase the sensitivity of the microarray B) allow the analysis of the expression of more genes C) allow simultaneous assay of levels of DNA and RNA D) allow comparison of gene expression between two samples
To Alexander Agassiz are attributed the following theories except:
a. colors of organisms were related to the absorption of different wavelengths of light at different depths. b. that the Caribbean and Pacific Oceans were once connected. c. that atolls form atop sinking mountains. d. none of the above