What two structures must interact in order to translate an mRNA into a polypeptide?
a. Ribosomes and tRNA
b. DNA and amino acids
c. tRNA and mRNA
d. Ribosomes and DNA
e. Amino acids and ribosomes
a
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Consider a community composed of grasses, prairie dogs, mice, bison and coyotes. Which of these organisms would be found at the bottom level of the trophic pyramid for this community?
A. coyotes B. bison C. prairie dogs D. mice E. grasses
Insects and bacteria appear to team up against a pesticide that is commonly sprayed on crops
The bean bug Riptortus pedestris is a common soybean pest and in a recent study was shown to acquire resistance to a common insecticide. This resistance is related to the presence of bacteria (Burkholderia sp.) living within its gut. In this mutually beneficial relationship, more than 100 million bacteria can live within the insect’s gut. Evidence suggests that these bacteria are able to break down the pesticide into carbon dioxide, which is used by the bacteria, and harmless waste products are then secreted. In a recent study, researchers fed bacteria-infested bean bugs and bacteria-free bean bugs a diet of soybean seedlings that had been treated with the pesticide. Most of the bacteria-infested bean bugs survived after eating the treated soybeans, but 80 percent of the bacteria-free bean bugs died.
In the study using bean bugs, soybeans and Burkholderia bacteria, how many domains are represented?
a. one b. two c. three d. four
A degenerative brain disorder transmitted by cannibalism is called ________.
A. scrapie B. herpes C. Creutzfeldt-Jakob disease D. kuru
In complex land plants, the diploid stage is resistant to adverse environmental conditions, such as dwindling water supplies and cold weather. The diploid stage progresses through which sequence?
a. gametophyte ? male and female gametes b. spores ? sporophyte c. zygote ? sporophyte d. zygote ? gametophyte e. spores ? gametophyte