Biofilm formation by Pseudomonas bacteria on the surface of a natural loofa sponge kept in the shower is an example of which type of relationship? 

A. Predation
B. Parasitism
C. Mutualism
D. Commensalism


Answer: D

Biology & Microbiology

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An insect, such as a moth or cricket, detects sound ____

a. though specialized tympanic membranes located near the head b. through a thinned region of the exoskeleton that forms a tympanum c. through general mechanoreceptors on its skin d. by using a specialized organ that measures the frequency of vibration of the surrounding air particles

e. through a series of mechanoreceptors arranged in a lateral line

Biology & Microbiology

You have discovered a new organism that displays bilateral symmetry during its larval stage, radial symmetry as an adult, develops three germ layers during embryonic development, and forms a mouth opposite the blastopore. Which classification for this organism is most likely?

a. Ctenophora b. Placozoa c. Echinodermata d. Cnidaria

Biology & Microbiology

After meiosis, the gamete joins with another gamete in all eukaryotic organisms.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Which of the following statements about plant toxins against herbivores is false?

A. Even a little bit of the toxin will be deadly. B. The toxin may not be toxic unless it is metabolized in the intestine of a herbivore. C. Some toxins can over stimulate particular physiological processes. D. The toxin may have also have a bad taste. E. The toxin may be kept in a membrane-bound structure to keep it from harming the plant.

Biology & Microbiology