How might mutations in the dnaQ sequence, whose enzyme is involved in DNA proofreading, be beneficial for a microbe in a highly competitive and dynamic community?
What will be an ideal response?
Answer: Mutations in dnaQ would result in an increase in mutation rate; however unrepaired mutations are not always lethal. In this situation, mutagenesis might be thought of as creating diversity of a microbe's genome. Genetic diversity might create a genotype different enough that a new phenotype arises. If for example the new phenotype is an ability to catabolize a particular compound, this could provide the cell with the ability to survive using a different substrate for energy when others are limited. Also, if a certain cell surface component is the target for phage infection and lysis, a different gene sequence could modify the surface component to perhaps enhance survivability in the environment.
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When carbon dioxide is absorbed into water, the solution becomes more
(a) acidic. (b) basic. (c) warm. (d) red.
The Cohesion-Tension Theory explains the role of ________ in long-distance water transport.
A. membranes B. transpiration C. sap movement D. plasmodesmata E. surface tension
The mass extinction of the Permian period
A. All of the answer choices are correct. B. was caused by a long series of volcanic eruptions. C. was caused by a drop in sea level. D. was caused by a rise in global temperature. E. paved the way for the age of dinosaurs.
Which of the following is NOT a characteristic of turtles?
a. a carapace b. jaws c. teeth d. a plastron