Why is sulfur cycling more complex to study than other nutrient cycles such as the nitrogen cycle? How might this influence researchers whose primary research interest is in understanding sulfur cycling?
What will be an ideal response?
Answer: Most other nutrient cycles are either exclusively or primarily processed through living organisms, but transformations in certain sulfur compounds also readily occur abiotically. Sulfur also has many different redox states. Researchers studying sulfur cycling need to consider abiotic redox reactions along with whichever organisms they are looking into for a particular step in the sulfur cycle. This requires adding additional abiotic experiments in addition to the ones containing living organisms of interest.
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Small RNA molecules that specifically down-regulate expression by binding to the appropriate mRNA molecule and inhibit translation are
A) mRNAs. B) siRNAs. C) tRNAs. D) rRNAs. E) miRNAs.
Which statement about bilateral symmetry is FALSE?
a. Bilateral symmetry evolved in cnidarians. b. Bilateral animals tend to have cephalization. c. Bilaterally symmetrical animals has three axes. d. Bilateral symmetry animals have a mesoderm. e. Animals with bilateral symmetry have dorsal and ventral surfaces.
Which of the following types of genetic material undergo recombination during meiosis?
a. sister chromatids b. sister chromatids and homologous chromosomes c. all four chromatid d. homologous chromatids
Lactobacillus acidophilus ferments _____in the vagina into____, which protects against pathogenic microbes.
a) pyruvate, citric acid b) glycogen, pyruvate c) Lactic acid, citric acid d) glycogen, lactic acid