Practice Questions

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#Question id: 343

Assume that acid rain has lowered the pH of a particular lake to pH 5.0. What is the hydroxide ion concentration of this lake?

#1. Molecules and their Interaction Relevant to Biology

1 × 10^-9 mol of hydroxide ions per liter of lake water
1 × 10^-5 mol of hydroxide ions per liter of lake water
5.0 M hydroxide ion
5.0 × 10^-5 mol of hydroxide ions per liter of lake water

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#Question id: 19884

#13. Methods in Biology

The first successful transformation of rDNA molecules into a bacterium was carried out by

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#Question id: 5701

#8. Inheritance Biology

Cross-over suppressors are production of gametes having cross over products is lethal. Which of the following statement is incorrect?

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#Question id: 8892

#9. Diversity of Life Forms

Which of the following correctly characterizes the phylum Rotifera?

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#Question id: 12100

#10. Ecological Principles

Prairie dogs once covered the expanses of the Great Plains. Their grazing made the grass more nutritious for the huge herds of bison, and a variety of snakes, raptors, and mammals preyed on the rodents. In fact, the black- footed ferret (now endangered) specialized in prairie dog predation. Today, growing housing and agricultural developments have covered many prairie dog towns. Which of the following statements about prairie dogs is true?

TLS Online TPP Program

#Question id: 11957

#7. System Physiology – Animal

Because the foods eaten by animals are often composed largely of macromolecules, animals need to have mechanisms for ________.