In the rumen, the carbohydrate fermentation end products include
A. methane.
B. acetate.
C. carbon dioxide.
D. All of the choices are correct.
Answer: D
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If x indicates the location of fossils of two closely related species, then fossils of their most-recent common ancestor are most likely to occur in which stratum?
A) A B) B C) C D) D
Extrachromasomal DNA is found in ____________________________
A. mitochondria B. plasmids C. nucleoid D. nucleoli E. mitochondria AND plasmids
Lysosomes contain enzymes that the cell uses to break down macromolecules and damaged organelles. The enzymes do not function as well, if at all, in the cytoplasm surrounding the lysosomes. Why not?
a. The enzymes are strongly hydrophilic, and dissolve too rapidly if they are not contained by lysosomes. b. The enzymes bind to the inner lysosome membrane and break down macromolecules mechanically. c. The enzymes require an environment acidic enough to damage other organelles within the cytoplasm. d. When exposed to cytoplasm, the enzymes automatically assemble lysosomes from free macromolecules.
Compare and contrast aerobic and aerobic bacterial photosynthesis in terms of a) the source of electrons used by each; b) the final products of both reactions
What will be an ideal response?