Some patients who have suffered from polio develop symptoms 30-40 years later in the form of
A. repeated cold symptoms.
B. meningitis.
C. encephalitis.
D. crippling deterioration and dysfunction in the polio-affected muscles.
E. deterioration of the nerves that control polio-affected muscles.
Answer: D
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Recent fossil discoveries may represent the earliest animal species ever found. How old are they?
a. 430 million years old b. 25 million years old c. 650 million years old d. 5 billion years old
One of the pyrimidine bases in a DNA molecule is adenine
__________________ Indicate whether the statement is true or false.
These molecules can directly convert extracellular signals into intracellular signals.
A. G proteins B. Adapter proteins C. Scaffolds D. Second messengers E. Membrane receptors
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply)
A. flowers produce a high volume of nectar and sugar B. flowers are low to the ground C. long tubular flowers D. blooming time of the flowers coincides with the arrival of the hummingbirds E. flowers are colored violet and blue