The chemotherapeutic agent must reach levels in the body that are ________ the pathogen's MIC value if it is going to be effective.
A. equal to
B. greater than
C. less than
Answer: B
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Which of the following would NOT be an example of negative feedback control in homeostasis?
A. Blood volume and pressure drop due to minor bleeding. This decreased pressure causes the kidneys to increase water reabsorption to restore blood volume and pressure. B. Exposure to cold water causes body temperature to drop. Decreased stimulation of heat receptors causes constriction of blood vessels near the skin and better retention of heat. C. Glucose levels rise following consumption of a big dessert, triggering release of insulin which causes glucose levels to fall. D. During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors. E. Blood levels of glucose fall during sustained exercise, causing the release of glucagon which stimulates the release of glucose into the blood.
All multicellular organisms have a nervous system
A. true B. false
The terminal ends or "tips" of a chromosome are called
A) genes. B) loci. C) chromatids. D) telomeres. E) centromeres.
The pigment ____ is commonly found in bacteria but not land plants
a. chlorophyll a b. chlorophyll b c. xanthophyll d. phycocyanin e. carotene.