Over __________ genes are involved in skin color
determination.
a. 100
b. 40
c. 10
d. 1
e. 1000
Answer: a
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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.
Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. hollow cylinder. B. pleated sheet. C. icosahedron. D. helix. E. ribbon.
________ possess accessory photosynthetic pigment phycoerythrin, which gives them their characteristic red color.
A. Brown algae B. Green algae C. Red algae D. Diatoms
A newly mated queen ant establishes an ant nest in an unoccupied patch of suitable habitat. The population of the nest grows quickly at first, then levels off at carrying capacity. Which of the following models best describes its population growth?
A) linear B) logarithmic C) logistic D) exponential