After amplifying one gene of interest using PCR (polymerase chain reaction), you pour your DNA sample into a gel to ensure that the reaction worked. To your surprise, two bands are present on the gel instead of a single band. What is a likely explanation for this outcome?
a. The gene contains a mutation.
b. The gene is codominant.
c. The DNA sample was derived from a haploid individual.
d. Two alleles exist for the gene and they vary in size. The DNA sample was derived from a diploid individual.
Answer: d. Two alleles exist for the gene and they vary in size. The DNA sample was derived from a diploid individual
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Thiobacillus species are acidophilic chemolithotrophs capable of autotrophic growth. They perform the dissimilative oxidation of H2S, So, thiosulfate, or Fe+2
Diagram or explain how Thiobacillus species obtain carbon and energy for growth and predict what type of environment they would be found in. What will be an ideal response?
Male crickets create sounds that we call "chirps" by rubbing one wing against the other. Female parasitic flies are attracted to the chirps and lay their eggs on the male once they locate him. Is this an example of communication?
A. Yes, because one individual produced information. B. No, because multiple individuals received information. C. Yes, because information from the sender altered the receiver's behavior. D. No, because the exchange of information resulted in a cost to the sender. E. Yes, because the exchange of information resulted in a benefit to the receiver.
A danger of nitrogen saturation is
A) increased productivity. B) basic soils. C) acidic soils. D) lack of carbon.
Which one of the following marine ecosystems would be expected to have the lowest species diversity and primary production per unit area?
A. Oligotrophic oceans B. Intertidal zone C. Upwelling regions of ocean D. Coral reefs E. Estuaries