Food webs model the relationships among species that live in the same environment. Which of the following best illustrates a producer-decomposer relationship in an ecosystem?

A) a ladybug eating aphids
B) a vulture eating from a rabbit carcass
C) a squirrel eating walnuts
D) mushrooms on a tree stump


Ans: D) mushrooms on a tree stump

Biology & Microbiology

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In an effort to clarify and standardize microbial taxonomy, the International Committee on Systematics of Prokaryotes (ICSP) recommends four criteria to meet a "gold standard" for species assignment. Which of the following is not part of the criteria?

A. Less than 3% divergence in rRNA gene sequence B. Whole genome similarity (as determined by DDH) of at least 70% C. Melting temperature of the DNA (reflection of the G+C content) within 58°C D. Bioinformatics ecotype analysis showing similar environmental niches E. Phenotypic similarity to others microorganisms in the group

Biology & Microbiology

Carl Woese proposed the concept of the domain based on differences of which of the following cellular molecules?

A) transfer RNA B) membrane lipids C) ribosomal RNA D) DNA E) proteins

Biology & Microbiology

What are the source of antibody-producing cells?

A. Monocytes B. T cells C. Macrophages D. B cells E. Plasma cells

Biology & Microbiology

What number process does isolation correspond with?

What will be an ideal response?

Biology & Microbiology