Why do eukaryotic cells have to undergo the individual steps of mitosis while prokaryotic cells can merely pull in half by binary fission?
What will be an ideal response?
When there are a number of chromosomes, as there are in most eukaryotic cells, special measures are needed to ensure that each daughter cell has a copy of each and every parental chromosome. Prokaryotes have only one circular chromosome that attaches to the cell membrane. Its replicates are separated when the cell pulls apart and becomes two.
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Evolution is driven by
A) random mutation. B) novel metabolic pathways. C) selection pressure. D) selection pressure applied to random mutation.
Multigene families
a. come from a single gene duplication event. b. come from repeated cycles of gene duplication followed by mutation. c. from single point mutations. d. come from exon shuffling. e. come from deletions of genes.
Individual organisms do not evolve but populations of such organisms have the capacity to do so
a. true b. false
Most of the processes that influence the hydrologic cycle are
A. biological processes. B. physical processes. C. ecosystem processes. D. wind processes.