A hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event giving rise to extra legs would be a good example of
A) punctuated equilibrium.
B) species selection.
C) habitat selection.
D) changes in homeotic genes.
E) allometry.
Answer: D) changes in homeotic genes.
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Cardio-cerebral resuscitation (CCR) differs
from CPR in what way?
a. in CCR, an electrical shocking device is used but not in CPR b. in CPR, an electrical shocking device is used but not in CCR c. in CCR, mouth-to-mouth resuscitation is used but not in CPR d. in CPR, mouth-to-mouth resuscitation is used but not in CCR e. CCR is not as effective as CPR
The type of cell responsible for the production of red and white blood cells in bone marrow is the
A) osteon. B) osteocyte. C) osteoclast. D) stem cell. E) canaliculi.
Cells are always producing proteins from every gene they possess.
a. true b. false
Which organism often grows in dense biofilms and frequently causes nosocomial infections by colonizing medical tubes or devices?
a) Pseudomonas aeruginosa b) Propionibacterium acnes c) Mycobacterium ulcerans d) Streptococcus pyogenes