Define a species cluster and provide examples

What will be an ideal response?


A species cluster is a group of closely related species recently descended from a common ancestor.
Species clusters are often found in oceanic archipelagos because of multiple invasions on each island
in an archipelago. Species of fruit flies on the Hawaiian Islands provides an example of a species
cluster that evolved relatively rapidly.

Biology & Microbiology

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The first identification test performed on a clinical isolate of gram-positive, catalase-positive cocci would likely be the:

a. penicillin test. b. Gram stain. c. oxidase test. d. coagulase test.

Biology & Microbiology

Facilitated diffusion is specific, which indicates that ____

a. a specific protein will transport certain polar or charged molecules but not others b. only one specific integral protein per membrane is involved in this process c. the energy molecule ATP is specifically required for transport d. only specific hydrophobic molecules can be transported

e. transport of molecules occurs only in specific cells

Biology & Microbiology

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration

Phosphate import depends on a pH gradient across the membrane—more acidic outside the cell than inside the cell. Phosphate transport is an example of _____. A) passive diffusion B) facilitated diffusion C) active transport D) cotransport

Biology & Microbiology

Which of the fungal groups is mismatched with the asexual spore produced?

A. Chytridiomycota-zoospores B. Zygomycota-sporangiospores C. Ascomycota-conidiospores D. None are mismatched. They are all correctly matched.

Biology & Microbiology