In a muscle organ like the biceps muscle,
A. the entire muscle is stimulated at the same time.
B. several nerve fibers enter the muscle and each stimulates specific muscle cells.
C. several nerve fibers enter the muscle, but each fiber stimulates most of the cells in the muscle.
D. there are two or three motor units.
B. several nerve fibers enter the muscle and each stimulates specific muscle cells.
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A co-evolutionary arms race is when a predator develops new traits in response to traits that have developed in their prey
If the Sierra newt produces a potent neurotoxin called tetrodoxotoxin that causes paralysis in animals that consume them, then a co-evolutionary response of their predators, the garter snake, might be: A. adaptation to a different food source B. developing the ability to produce a toxin that kills the newt C. increasing the speed at which the garter snake can sneak up on the newt D. developing resistance to tetrodoxotoxin
In Fredrick Griffith's classic experiments,
A. mice injected with strain R cells died of pneumonia. B. mice injected with strain S cells died of pneumonia. C. mice injected with live strain R cells and heat-killed strain S cells died of pneumonia. D. mice injected with strain S cells, or live strain R cells and heat-killed strain S cells died of pneumonia. E. mice injected with strain R cells, or live strain R cells and heat-killed strain S cells died of pneumonia.
Which element is a macronutrient in plants?
a. sodium b. calcium c. manganese d. zinc e. copper
A microbial mat
A. is a form of biofilm. B. is poorly organized. C. contains only obligate anaerobes. D. is constructed to prevent interactions between the various layers of microorganisms. E. is a form of biofilm AND is poorly organized.