You have been using massive amounts of weed killer and insecticide to kill weeds in your yard, as well as the grubs and aphids that are munching on your roses and your grass. What effect might this have from a microbiological standpoint?
A. Loss of microbial diversity in the soil
B. Damage to the mycorrhizae
C. Reduction in microbial numbers in the soil
D. Damage to the nitrogen fixing bacteria
E. All of the above may be effects of this practice.
Answer: E
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In earthworms, what do the nerve cord, the setae, the circular muscles, and the metanephridia have in common?
A. They are serially repeated in the body segments of the body. B. They are all used in locomotion. C. They all play a role in excretion of waste from the body. D. They all play a role in the reproductive activities of the earthworm.
What part of the cell cycle - in an actively
dividing cell - does preparation for DNA replication take place?
a. G1 b. S c. G2 d. prophase e. telophase
The tube feet of sea stars are used primarily for ____
a. excretion of excess water b. locomotion c. reproduction d. circulation e. sensation
The incorporation of DNA into the information transfer system was advantageous because DNA is a(n) catalytic
molecule. ______________ Indicate whether the statement is true or false.