How do eukaryotic cells maintain underwound DNA?
A. They have a topoisomerase that can introduce negative supercoils.
B. They can introduce negative supercoils by wrapping the DNA around proteins.
C. They only relax the positive supercoils that form during transcription and let the negative ones accumulate.
D. All of these choices are correct.
E. None of these choices is correct.
B
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Which of the following brain regions helps regulate hunger and thirst?
A. cerebrum B. cerebellum C. thalamus D. hypothalamus E. medulla oblongata
Fermentation ________.
A. only occurs in aerobic organisms B. is equivalent to aerobic respiration in ATP production C. requires an organic electron acceptor D. requires oxygen E. is the same as anaerobic respiration
When does a CAM plant take in atmospheric CO2?
a. daytime only b. nighttime only c. summer only d. winter only e. anytime the Calvin cycle is occurring
In one or two words, give two characteristics of mitochondrial genomes
What will be an ideal response?