Mutations are permanent changes in a cell's DNA base sequence. They typically have negative consequences, but they are also the original source of genetic variation and the raw material of evolution. How can mutations accumulate, given that cells have repair systems that fix changes or breaks in DNA strands?
What will be an ideal response?
While it is true that cells have repair mechanisms to fix structurally altered or discontinuous DNA, these may not be 100 percent foolproof. Perhaps the repair enzymes might come upon a mistake that they have not encountered before, and therefore have no workable repair mechanism. Or perhaps the repair enzymes themselves have been produced from mutated genes and are therefore mutants.
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In a monohybrid cross with complete dominance, the F2 offspring should contain ____
a. two different phenotypes and two different genotypes b. two different phenotypes and three different genotypes c. three different phenotypes and two different genotypes d. three different phenotypes and three different genotypes e. two different phenotypes and one genotype
________ are large cells that clean up debris and destroy bacteria by phagocytosis
Fill in the blank(s) with correct word
Which of the following contain prokaryotic organisms that are pathogenic to humans?
a. Archaea b. Eukarya c. Bacteria d. Mercaria
Which of the following statements is FALSE?
A) Fluoroquinolone inhibits DNA synthesis. B) Acyclovir inhibits DNA synthesis. C) Amantadine inhibits the release of viral nucleic acid. D) Interferon inhibits glycolysis. E) Azoles inhibit plasma membrane synthesis.