In some shade plants, the negative effect of high light levels on the rate of photosynthesis is referred to as ________
Fill in the blank(s) with correct word
photoinhibition
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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.
What are somites?
a. neural tissue that gives rise to the cranial nerves b. neural tissue that give rise to the peripheral nerves c. neural tissue that gives rise to the two hemispheres of the brain d. mesoderm tissue that gives rise to the bones and skeletal muscles of the trunk e. mesoderm tissue that gives rise to the smooth muscles of the heart and lungs
RNA molecules that also act as enzymes are given the name
A. cofactors. B. coenzymes. C. allosteric enzymes. D. ribozymes.
Ubiquinone is one of two mobile electron carriers in the electron-transport chain. Where does the additional pair of electrons reside in the reduced ubiquinone molecule?
(a) The electrons are added directly to the aromatic ring. (b) The electrons are added to each of two ketone oxygens on the aromatic ring. (c) The electrons are added to the hydrocarbon tail, which hides them inside the membrane bilayer. (d) Both electrons, and one proton, are added to a single ketone oxygen bound to the aromatic ring.