The science of classifying organisms is called
a. natural history
b. taxonomy
c. evolution
d. morphology
e. paleobiology
B
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Which of the following is a component of the blood-brain barrier?
All of the following are appropriate strategies for overcoming drug resistance in bacteria except
A. decreasing the use of antibiotics in agriculture. B. prudent use of antibiotics when treating viral infections. C. heightened infection control in health care facilities. D. patient compliance with dosage instructions when taking antibiotics.
About 10-20% of patients with Leigh Syndrome, a mitochondrial disease, have a mutation in MT-ATP6, a gene that
codes for ATP synthase. These patients often experience high levels of _____ in their cells due to an increase in levels of pyruvate that are unable to convert to acetyl-CoA.
a. NADH b. FADH2 c. lactate d. ethanol e. carbon dioxide
Why are flexors and extensors considered antagonistic muscles?
A. Both muscle groups bend a limb at the joint, but each can only contract while the other extends. B. Both muscle groups exert only a pulling force when they contract, but they produce opposing movements of the joint. C. One muscle group exerts a pulling force while the other exerts a pushing force. D. Hypertrophy of one muscle group induces atrophy of the other muscle group.