As electrons pass from photosystem II to photosystem I, they return to a lower energy level,
1.releasing free energy which is all lost as heat.
2.used to pump protons across the thylakoid membrane.
3.used to synthesize NADPH.
4.used to split water and release oxygen.
5.re-emitted as light.
3
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In all deuterostomes, the cells divide parallel to and at right angles to the polar axis. This pattern is called _______________.
Fill in the blank(s) with the appropriate word(s).
What does not happen in the cytokinesis of plant cells?
A. Vesicles from the golgi apparatus move along the microtubules and fuse form cell plate. B. Cell wall forms between the two daughter cells.. C. The two nuclei are segregated into separate daughter cells. D. When the vesicles fuse, their membranes contribute to the formation of plasma membrane on either side of the cell plate. E. Formation of cleavage furrow to separate the cells.
If you eliminated all sources of calcium (dairy products, some vegetables) from your diet, the level of which of the following would rise in an attempt to supply calcium stored in your body to the tissues that need it?
a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. thyroid hormone
The sex of most mammals, birds, and insects is determined by:
a. the temperature. b. the external environment. c. sex chromosomes. d. chance. e. the internal envronment.