The closest relatives of fungi and animals are
a. amoebozoans.
b. chlorophytes.
c. alveolates.
d. stramenopiles.
e. none of these
A
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A surge in __________ triggers tadpole
metamorphosis. a. testosterone b. cortisol c. atrazine d. thyroid hormone e. pheromones
Cells that remove debris, provide support, bring nutrients and produce nerve insulation are
a. neurons. b. chondrocytes. c. neuroglia. d. osteocytes. e. hepatocytes.
You have developed an antibiotic that inhibits a bacterial enzyme critical for the formation of the cell wall. However, after only a short time, the bacteria become resistant to the antibiotic, and it's no longer effective
Which mechanism is responsible for the bacteria no longer being sensitive to your antibiotic? A) Over time, your antibiotic selected for bacteria containing a gene that codes for an enzyme capable of metabolizing your antibiotic. B) The bacteria learned to avoid taking up the antibiotic in their surroundings. C) The immune system of bacteria recognized the antibiotic as being foreign and quickly removed any antibiotic before it could accumulate to toxic levels. D) Through the use of plasmids, bacteria communicated with other bacteria that a noxious chemical was present in the environment.
The major difference between protostome animals and deuterostome animals is _______.
a) whether or not they reproduce sexually or asexually b) the presence or absence of a gastrovascular cavity c) which opening to the digestive system forms first d) their type of symmetry