The symptoms of diphtheria are due to an exotoxin that blocks proteins synthesis in host cells
Indicate whether the statement is true or false
TRUE
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Suppose you are studying the nitrogen cycling in a pond ecosystem over the course of a month. While you are collecting data, a flock of one hundred Canada geese lands and spends the night during a fall migration
What could you do to eliminate error in your study as a result of this event? A) Find out how much nitrogen is consumed in plant material by a Canada goose over about a twelve-hour period, multiply this number by 100, and add that amount to the total nitrogen in the ecosystem. B) Find out how much nitrogen is eliminated by a Canada goose over about a twelve-hour period, multiply this number by 100, and subtract that amount from the total nitrogen in the ecosystem. C) Find out how much nitrogen is consumed and eliminated by a Canada goose over about a twelve-hour period and multiply this number by 100; enter this +/- value into the nitrogen budget of the ecosystem. D) Do nothing. The Canada geese visitation to the lake would have negligible impact on the nitrogen budget of the pond. E) Put a net over the pond so that no more migrating flocks can land on the pond and alter the nitrogen balance of the pond.
The intrauterine device is a cuplike rubber device that blocks the cervix in females
Indicate whether the statement is true or false.
Fire in the dry shrublands does not kill the
small bushy plants most probably because a. these plants have a tough protective bark. b. their leaves are very heavy and wet. c. they can resprout from roots. d. the Forest Service puts the fires out quickly. e. the fires burn the taller plants and burn out before reaching ground level
The cerebral region that controls emotions and
functions in memory is the a. medulla. b. corpus callosum. c. limbic system. d. cerebral cortex. e. cerebellum.