Using the CRISPR/Cas9 system, a genetically-engineered sgRNA complementary to a target site in the genome binds to Cas9 endonuclease. A mutation can occur at this site when
A) Cas9 cleaves the DNA and nonhomologous end-joining results in a small deletion.
B) Cas9 cleaves the DNA and homologous recombination with the homologous chromosome is used to repair the break.
C) Cas9 cleaves the DNA to remove the complementary sequence.
D) Cas9 cleaves the DNA and nonhomologous end-joining correctly repairs the break.
A) Cas9 cleaves the DNA and nonhomologous end-joining results in a small deletion.
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Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. orientation with respect to the Earth's magnetic field B. move to other bacteria and aggregate with them in response to chemical signals C. find nutrients by moving upward in the water column with the aid of flotation devices D. respond to other individual bacteria and transmit DNA via conjugation E. none of the other options presented
A prolonged period without rain is causing a major drought in the American Midwestern states. How would you expect crops to respond initially to the stress caused by the drought?
A. They will take in more carbon dioxide. B. They will take in less carbon dioxide. C. They will release more oxygen. D. They will increase rates of photosynthesis. E. They produce fewer secondary metabolites.
The formula for glucose is C6H12O6. What is the formula for a polymer made by linking ten glucose molecules together by dehydration synthesis?
A. C60H100O50 B. C60H102O51 C. C60H120O60 D. C60H111O51
Obligate _____ exist in salt ponds because of their ability to withstand high osmotic pressure.
Fill in the blank(s) with the appropriate word(s).