Which of the following could be considered an oligotrophic (growing at low nutrient levels) environment inhabited by alpha-proteobacteria?

A. Anaerobic environment
B. Growth in food items
C. Symbiotic growth
D. Remote marine environments


Answer: D

Biology & Microbiology

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In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars

After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.

Biology & Microbiology

A spider and an insect are both arthropods, but they have some different characteristics. Choose the descriptions that are true for BOTH a spider and an insect. Check all that apply.  

_____  They have a head, a thorax, and an abdomen. _____  They have an open circulatory system. _____  Some species are carnivorous and some are herbivorous. _____  They have a chitinous exoskeleton. _____  They have spinnerets. _____  They molt. _____  They are members of Ecdysozoa. _____  They have sensory antennae. _____  They have metamorphosis. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required?   Gather Content · What do you already know about arthropods?   Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?   Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

Which type of protist symbiotically provides nutrients to coral polyps?

a. amoebas b. euglena c. diatoms d. dinoflagellates

Biology & Microbiology

What are mitochondria

What will be an ideal response?

Biology & Microbiology