Vestigial structures _________________.
a. are essential for an organism to live
b. have no known function
c. cause reproductive isolation
d. cause sympatric speciation
Answer: b. have no known function
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The amoeba E. histolytica is a pathogen that causes liver abscesses in infected individuals. Which of the following represents the most likely metabolic classification?
a. aerobic phototroph b. anaerobic heterotroph c. mixotroph d. phagocytic autotroph
Upon ingestion of a food particle by a protozoan, the food particle is in a(n) ________.
A. mitochondrion B. endoplasmic reticulum C. phagocytic vacuole D. lysosome
Bacillus licheniformis secretes a compound that inhibits the growth of other Gram-positive bacteria. This is an example of a(n)
A) analog. B) antibiotic. C) chemotherapeutic. D) porin. E) toxin.
Why do cells pump things like protons against their electrochemical gradients?
What will be an ideal response?