The freshwater leech is an organism that feeds off of the blood of other organisms such as frogs and turtles. Which interaction describes the relationship between freshwater leeches and frogs or turtles?
A) herbivory
B) predation
C) mutualism
D) parasitism
Answer: D
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Answer the question using the accompanying figure. This figure illustrates the life cycle of a ____
a. brown algae b. green algae c. water mold d. plasmodial slime mold e. cellular slime mold
Blanks “C” and “D” should be labeled respectively
a. in; large b. in; small c. out; large d. out; small e. none of these
Write out the growth equation including the following factors: natality, mortality, immigration, and emigration
Provide a one-sentence explanation for the impact of each of these factors on the population growth rate. What will be an ideal response?
The human gene for a protein hormone has been isolated. Scientists want to introduce this gene into a bacterial host, modifying the bacteria so that it can be used to produce this hormone. After successfully introducing the gene on a plasmid, the bacteria produced the protein hormone, but the protein was defective, longer than normal, with intervening stretches of amino acids not found in the native protein. Which solution would be most likely to resolve this problem?
A. Treat the defective protein with enzymes. B. Start over, introducing a complementary DNA (cDNA) copy of the gene into the bacterial host. C. Introduce human ribosomes into the bacteria. D. Introduce human mRNAs into the bacterial host.