When a red blood cell is placed in a hypotonic solution, it will _____
1.swell, because water will diffuse in
2.swell, because active transport will bring water in
3.shrink, because water will diffuse out
4.shrink, because salt will flow in
1
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Which of the following scenarios would provide the most relevant data on population density?
A) Count the number of nests of a particular species of songbird and multiply this by a factor that extrapolates these data to actual animals. B) Count the number of pine trees in several randomly selected 10-meter-square plots and extrapolate this number to the fraction of the study area these plots represent. C) Use the mark-recapture method to estimate the size of the population. D) Calculate the difference between all of the immigrants and emigrants to see if the population is growing or shrinking. E) Add the number of births and subtract the individuals that die to see if the population's density is increasing or decreasing.
Genetic drift will have a progressively larger impact on allele frequencies in a population as ____
a. gene flow increases b. population size decreases
c. mutation rate decreases d. population size increases e. random mating increases
Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake. Although the algae are naturally-occurring in the lake, when adjacent farm fields are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit. Which of the following statements is incorrect regarding the overgrowth of algae?
A. Lakes have sufficient micronutrients for algae to grow. B. The nitrogen in the fertilizer is in the ammonium form, the preferred nitrogen source of most microbes. C. The phosphorus in the fertilizer is in the phosphate form, the preferred phosphorus source of most microbes. D. The algae are heterotrophs. E. The carbon source for these algae is not limiting in lakes.
Compare and contrast infection with Taenia saginata and Echinococcus granulosus in humans, including the consequences of the infections.
What will be an ideal response?