Which is a likely result of a mass extinction?
a. create “empty niche space” that can stimulate radiation of surviving groups
b. eliminate non-beneficial alleles from gene pools
c. increase the rate of new mutations
d. decrease the rate of new mutations
e. cause mutations that have greater than usual effect
A
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Which of the following examples or elements of culture is uniquely human? Select all that apply
A. an individual learning by imitation from another member of its own species B. an individual teaching another individual of its own species by tailoring the information available to the individual being taught C. regional variation in tool use D. language E. None of these are uniquely human.
Does the presence of introns/exons in eukaryotic cells provide more potential diversity in gene products (proteins) than is possible in prokaryotic cells?
A. It doesn't-this is a trick question. There's the same potential for gene products (proteins) in a bacterium with 1,000 genes as there is in a eukaryotic cell with 1,000 genes. B. It does-each exon and each intron could be used individually and discretely to make agene product (protein). Since bacteria lack these, they will have less ability to create different proteins. C. It does-exons/introns can be spliced together in different ways post-transcription to yield different mRNAs (and therefore, different proteins). Bacteria lack this system, so the gene you transcribe is translated into the only protein you'll end up getting. D. It does-exons/introns can be spliced together in different ways at the DNA levelto eventually yield different mRNAs (and therefore, different proteins). Bacteria lack this system, so the gene you transcribe is translated into the only protein you'll end up getting.
A bacterial culture has been exposed to UV radiation and is preparing to repair the DNA damage. Describe two mechanisms of repair used by E. coli to repair UV-induced DNA damage
Would you expect the bacteria to be able to repair more of the damage or less of the damage if they were placed in a dark environment after UV damage?
Compare and contrast the life-forms found in Domains Bacteria, Archaea, and Eukarya
What will be an ideal response?