Two-thirds of the plasma proteins are glucoprotein
1.True
2.False
2
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Which one of the following terms applies to the phylum Platyhelminthes?
A. radial cleavage B. protostome C. diploblastic D. acoelomate E. radial symmetry
The pH of the solution in which an enzyme-controlled reaction takes place
A. is not important, since enzymes work well at a variety of pH levels. B. is important, because changing the pH changes the shape of the enzyme. C. is important, because changing the pH increases the temperature and the enzyme is denatured. D. alters the substrate and, therefore, prevents the enzyme from attaching to the substrate.
When certain molecules are pumped across biological membranes against a concentration gradient via active transport, ATP is used
In the cells of our bodies, for example, sugars are actively transported and metabolized within the membrane-enclosed mitochondria. Prokaryotes, in contrast, lack mitochondria but are nonetheless able to metabolize the same sugars. Based on the details provided in this scenario, which of the following statements is expected to be TRUE? A) Overall, prokaryotes will gain more ATP per sugar molecule metabolized than will eukaryotes. B) Sugar metabolism in prokaryotes is exergonic, whereas in eukaryotes it is endergonic. C) The sugar-digesting enzymes in eukaryotic cells, such as sucrase, are not the same sugar-digesting enzymes found in prokaryotic cells. D) Prokaryotes and eukaryotes should have the same metabolic efficiency when digesting the same sugars, assuming their enzymes are the same.
Which action is unable to produce variation?
A. Crossing over B. Random alignment of chromosomes during meiosis C. Asexual reproduction D. Genetic recombination of alleles E. Sexual reproduction