Parasites have often been described incorrectly as having "devolved" from a more highly evolved organism. Why would it be more accurate to say that they are just as evolved as any other organism?
What will be an ideal response?
Evolution does not have an end goal. Every organism has evolved to perfectly fit its particular environment. A person could not live in another organism's intestine or liver, but a parasite can. To say that one organism is more or less evolved, or that it has somehow evolved backwards, is a subjective statement based one's perspective of value.
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Match the following items with the correct phrases.
_______1. Produced by some strains of Streptococcus pyogenes. _______2. Tetanospasmin is an example. _______3. Its presence in the bloodstream can lead to fever and septic shock. _______4. Produced by Clostridium botulinum. _______5. Produced by Clostridium difficile. a. neurotoxin b. enterotoxin c. diphtheria toxin d. endotoxin e. erythrogenic toxin
How many embryos did Nadya Suleman’s
doctor put into her uterus?
a. 8 b. 9 c. 10 d. 11 e. 12
The molecule (molecules) that fits into the active site of an enzyme and reacts with the enzyme is
A. always a protein. B. an analog. C. always a carbohydrate. D. a substrate. E. always broken down by the enzyme.
A scientist isolates a single-celled organism from the bottom of a sulfur hot spring. When examined under the microscope, it is clear that the cell is very small and contains no nucleus. Based on this evidence alone, in what domain of life is this organism?
A. Archaea B. It is impossible to determine anything based on this evidence alone C. Eukarya D. Bacteria E. Either bacteria or archaea