Continuous carbon assimilation in the Calvin cycle is made possible by the regeneration of
A) glyceraldehyde-3-phosphate.
B) dihydroxyacetone phosphate.
C) ribulose-1,5-bisphosphate.
D) glycerate-1,3-bisphosphate.
E) 3-phosphoglycerate.
Answer: C
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Other than the proteins that they encode, what is a major difference between cell-specific and housekeeping genes?
a. Cell-specific genes are expressed only in a single cell type; housekeeping genes are expressed in all cell types. b. Cell-specific genes have promoter proximal elements and enhancers; housekeeping genes have only promoter proximal elements. c. Cell-specific genes have promoter proximal elements that use cell-specific activators; housekeeping genes use "universal" activators. d. Cell-specific genes are only found in certain cell types; housekeeping genes are found in all cell types. e. Cell-specific genes have promoter proximal elements that use "universal" activators; housekeeping genes have promoter proximal elements that respond only to specific activators.
If the pH of the blood were to rise and the blood become less acidic, what affect would this have?
a. The red blood cells would secrete carbonic anhydrase. b. The blood would carry more CO2. c. Hemoglobin would release O2 more readily. d. Hemoglobin would be more likely to bind O2. e. Heme groups would bind more tightly to the globin.
This figure compares an intertidal habitat before and after an oil spill. Which one of the following organisms appears to persist after the spill?
1.fish
2.mollusks
3.echinoderms
4.barnacles
Which of the following lists plants in order from most primitive to most advanced?
A. ferns ® mosses ® angiosperms ® gymnosperms B. mosses ® gymnosperms ® ferns ® angiosperms C. mosses ® ferns ® angiosperms ® gymnosperms D. mosses ® ferns ® gymnosperms ® angiosperms