What unconsumed macromolecule from dead organisms eventually formed fossil fuels?
What will be an ideal response?
carbohydrates
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Which one of the following is the photosensitive protein that converts the energy of photons into electrical signals in the receptor cell?
A. opsin B. retinal C. chlorophyll D. organ of Corti
Matching. Choose the one most appropriate answer
for each. Some letters may not be used. 1. ___ abscisic acid 2. ___ annual 3. ___ biennial 4. ___ coleoptile 5. ___ ethylene 6. ___ salicylic acid 7. ___ gibberellin 8. ___ auxin 9. ___ phytochrome 10. ___ circadian 11. ___ short-day plant 12. ___ target cell 13. ___ long-day plant 14. ___ Pfr 15. ___ vernalization A. flower each successive year or after several years of vegetative growth B. promotes cell elongation in stems C. has receptor sites for a particular hormonal message D. a hollow, cylindrical organ that protects young leaves growing within it E. blue-green pigment that absorbs light energy F. low-temperature stimulation of flowering G. stimulates stomata closure and might be involved in root geotropism H. stimulates fruit ripening I. reproduces in spring J. produces only roots, stems, and leaves the first growing season and produces flowers the second year K. occurring on a 24-hour cycle L. flowers in autumn M. a nonhormonal plant growth regulator N. lives for only one growing season O. promotes stem elongation in plants P. pigment involved in flowering process
Aspirin helps prevent blood clots by ____
a. blocking the activation of thrombin b. reducing platelet aggregation c. reducing vessel spasm d. stimulating the conversion of fibrinogen to fibrin e. stimulating the activation of factor X
The process of ________ is described as semiconservative.
A. translation B. transcription C. mismatch repair D. transformation E. DNA replication