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Which of the following pairs of organism groups consist solely of prokaryotic cells?  

Which of the following statements best explains why the sodium-potassium pump is an electrogenic pump?  

Tay-Sachs disease is a human genetic disorder that results in the cellular accumulation of very large, complex, undigested lipids. Which of the following organelles is most likely defective in Tay-Sachs disease?  

Which of the following statements is true for water in its liquid state?  

In addition to activating or inhibiting enzymes through allosteric regulation, which of these mechanisms do cells also use to control enzymatic activity?  

A newly discovered unicellular organism isolated from acidic mine drainage is found to contain a cell wall, a plasma membrane, two flagella, and peroxisomes. Based on this information only, the organism is most likely to be ________.  

A young child who suffers from a metabolic disease is always tired and fatigued. Which of the following organelles is most likely malfunctioning in this disease?  

Which of the following functional groups is unreactive but when added to bases of DNA can alter gene expression?  

A compound contains hydroxyl groups as its predominant functional group. Which of the following properties of the molecule can be predicted with the information provided?  

A change of a single amino acid at a position distant from the active site of an enzyme can alter the substrate specificity ________.