How does the respiratory center control the diaphragm?
A. via the intercostal nerves
B. via the phrenic nerve
C. via the blood carbon dioxide level
D. via the blood pH
E. via the vagus nerve
Answer: B
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An explanation for a biological process that is substantiated by a large body of evidence is called a
A. hypothesis. B. theory. C. systems biology. D. reductionism. E. prediction.
The greatest rate of extinction of all time is/was probably caused by ____
a. an ice age b. unknown reasons c. formation of Pangea d. human activity e. asteroid impact
Arrange the following structures from largest to smallest, assuming that they belong to two generations of the same angiosperm
1. ovary 2. ovule 3. egg 4. carpel 5. embryo sac A) 4, 5, 2, 1, 3 B) 5, 4, 3, 1, 2 C) 5, 1, 4, 2, 3 D) 4, 1, 2, 5, 3
Most enzymes are:
A) nucleic acids. B) proteins. C) lipids. D) carbohydrates. E) vitamins.