People with high cholesterol levels often take drugs in an attempt to lower their cholesterol levels. One such drug is Lipitor. How does this drug work?
A) It prevents cholesterol from the diet from being absorbed in the small intestine.
B) It acts as a competitive inhibitor by binding to the active site of enzymes that normally produce cholesterol.
C) It enhances the activity of enzymes that help break down cholesterol in the body.
D) It increases the activation energy of enzymes needed to produce cholesterol.
Answer: B
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The oldest well-documented flowering plant fossils are Archaefructus, dating to about
a. 1.5 billion years ago. b. 420 million years ago. c. 250 million years ago. d. 125 million years ago. e. 17 million years ago.
How are viruses classified by the ICTV?
a. By their DNA sequence b. By their number of rRNA c. By their structural components d. By their host range and other characteristics e. By the Linnaean binomial nomenclature system
Which of the following is true?
A) K-selection operates in populations where populations fluctuate well below the carrying capacity. B) r-selection occurs in populations whose densities are very near the carrying capacity. C) Different populations of the same species will be consistently r- or K-selected. D) r- and K-selection are two extremes of a range of life history strategies. E) r-selection tends to maximize population size, not the rate of increase in population size.
During which of the following stages of food processing is undigested material removed from the digestive tract?
A) absorption B) elimination C) digestion D) ingestion