The gut-brain axis refers to
A. the location of dormant viruses that infect both the gut and the brain.
B. pores in the blood-brain barrier that permit the passage of glucose and other nutrients.
C. neurons in the spinal cord that connect the gut and the brain.
D. changes in brain chemistry and behavior caused by the gut microbiota.
Answer: D
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Horizontal gene transfer
A) can accelerate evolution of a species. B) can inhibit evolution of a species. C) has no role in evolution. D) has a role in evolution only if the gene transfer is to a different species.
Genetically modified crops have been banned in the United States
Indicate whether the statement is true or false.
How many thoracic vertebrae are in the spinal column?
a. 5 b. 7 c. 12 d. 4 e. 15
If 20% of nucleotides in the DNA of a particular organism contain thymine, estimate the percentage of cytosine that is present in the DNA.
A. 80% B. 30% C. 20% D. 40% E. 15%