A person reports to a clinic complaining of fever and abdominal pain. The abdomen is swollen, and blood tests indicate liver damage. A stool sample is examined under a microscope and found to contain eggs with a spine projecting from its surface. The indications are consistent with infection with
A) Ancylostoma duodenale.
B) Enterobius vermicularis.
C) Echinococcus granulosus.
D) Schistosoma mansoni.
E) Taenia solium.
D
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Which of the following statements is false regarding amphibolic pathways?
A. Glyceraldehyde-3-phosphate is used as a precursor for amino acid, lipid, and carbohydrate synthesis. B. Glucose is broken down in glycolysis; however, not all of the intermediates in the pathway are utilized as an energy source. Many leave the pathway to serve as precursors for complex molecules. C. Metabolic pathways are amphibolic, that is, catabolism and anabolism are intertwined in order to conserve energy in the cell. D. All organisms use metabolic pathways to synthesize the 20 amino acids necessary for protein synthesis using precursors from catabolic processes. E. Glucose is broken down during glycolysis to pyruvate; however, when glucose is in short supply, pyruvate is used as a precursor in the process of gluconeogenesis.
The result of __________ is the division of a cell’s chromosomes into two new nuclei, each of which has the same amount and type of DNA as the original nucleus. The division of the cells cytoplasm is called __________and occurs with the production of two new cells.
A. cytokinesis; mitosis B. interphase; mitosis C. mitosis; cytokinesis D. mitosis; interphase
Which type of membrane transport is most important for nutrient acquisition in nutrient poor environments?
A. Facilitated diffusion through channel proteins B. Facilitated diffusion through membrane carrier proteins C. Simple diffusion D. Active transport
Which of the following could be a potential consequence of unchecked human population growth?
a. famine in areas that are densely populated b. drought in areas that are sparsely populated c. fewer diseases in densely populated areas d. enhanced resource availability in populated areas