In the CRISPR/Cas system ________.
A. methylated DNA sequences are hydrolyzed, effectively destroying the viral DNA
B. bacteria integrate portions of the viral genome into their own so they have a molecular snapshot of their attacker to prevent future encounters
C. methylase enzymes add methyl groups to the viral nucleic acids, preventing transcription
D. restriction endonucleases digest viral genomes once they enter the cell if the viral DNA is not methylated
Answer: B
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Many metabolic pathways are ultimately concerned with ATP; either with the generation of ATP, or with the requirement of ATP for that pathway to function. Why is ATP so important to metabolism?
A. Hydrolysis of ATP is used to drive exergonic reactions B. Hydrolysis of the bond between adenine and ribose in ATP is commonly used to release energy that can be used to drive other cellular reactions C. The phosphate groups of ATP are held together by unstable bonds that can be broken to release energy D. ATP is a protein that serves as the energy currency of cells
The Red Queen hypothesis may explain
a. why asexual reproduction is easier and faster than sexual reproduction. b. why aphids seasonally alternate parthenogenesis with sexual reproduction. c. the existence of all-female species of animals. d. the connection between species interactions and sexual reproduction. e. why meiosis and fertilization alternate during sexual reproduction.
The nucleotide sequence in RNA to which RNA polymerase binds is called the promoter
__________________ Indicate whether the statement is true or false.
Which of the following about soil with low pH is false?
a. Aluminum is more soluble. b. Calcium phosphate becomes less soluble. c. Acidic soil can be found in Pygmy forest in California. d. Potassium is leached more readily from the soil. e. Manganese may be available in toxic concentrations.