The Gram stain, acid-fast stain and endospore stain have the following in common:
A. used on a wet mount of the specimen
B. use heat to force the dye into cell structures
C. outcome based on cell wall differences
D. use a negative stain technique
E. are differential stains
Answer: E. are differential stains
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The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the forest?
A) 2.5 trees per hectare B) 5 trees per hectare C) 10 trees per hectare D) 20 trees per hectare E) 25 trees per hectare
In general, which of the following is (are) largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?
A) Carbohydrates B) Proteins C) Nucleic acids D) Phospholipids E) Cytoskeleton
What is the substrate of the first step in the citric acid cycle?
A. Pyruvate B. Coenzyme A C. Fructose bisphosphate D. Oxaloacetate E. Citrate