What is the likely explanation for the observation that during mass extinctions the size of a taxon's range is no longer positively correlated with its chance of survival?
What will be an ideal response?
ANS:
Mass extinctions take place on a global scale. Other than with local extinctions, large ranges no longer protect a taxon against global effects during a mass extinction.
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Which of the following mechanisms would most likely be involved in repairing a single point mutation?
A. mismatch repair B. base excision repair C. nucleotide excision repair D. base excision repair and/or nucleotide excision repair E. mismatch repair and or base excision repair
What structure is indicated by the arrow in this image?
A. sporangia B. supporting stalk C. light sensitive hyphae D. mycelium E. rhizoids
The transport receptor, exportin, transports:
A. mRNA to the nucleus when associated with GDP-bound Ran protein. B. mRNA to the cytoplasm when associated with GTP-bound Ran protein. C. noncoding RNA to the nucleus when associated with GDP-bound Ran protein. D. mRNA to the cytoplasm when associated with GDP-bound Ran protein.
Various species of scavengers fighting over the carcass of a dead animal is referred to as
A) consumption competition. B) preemptive competition. C) encounter competition. D) overgrowth competition.