Which statement regarding the brain is true?
A) Ventricles in the brain are filled with interstitial fluid.
B) The blood-brain barrier helps to maintain a stable chemical environment for the brain.
C) Layers of connective tissue, called epithelium, surround and protect the brain and spinal cord.
D) White matter is composed of mainly dendrites.
Answer: B
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Edith's checkerspot butterflies are considered "indicator species" because they
a. can determine the make up of the community of organisms through predation. b. are signals for the presence of predators that prey on the butterflies. c. are important signals of ecological change. d. are only present during certain seasons. e. indicate when food supplies are low by changing their behavior.
Consider the ADH reaction below, and answer the following question. ADH stands for alcohol dehydrogenase
In this reaction, acetaldehyde represents the ____.
a. enzyme b. reactant
c. product d. activation energy e. trigger
A composite organism consisting of a fungus and a single-celled photosynthetic species is called a ____
a. mycorrhiza b. rust c. lichen d. mycelium e. chytrid
The average annual temperature among geographic regions is plotted on the x-axis of a graph and the spiciness of local food in that region is plotted on the y-axis
If the hotness of local food increases as the average annual temperature increases, then what can be concluded? A) The spiciness of local food does not correlate with the regional average annual temperature. B) Food is spicy in warm climates because the warm temperatures make local foods more spicy. C) The relationship between the two variables shows causation but is not correlation. D) Spiciness of food and annual average temperature are correlated, but causation is not implied.