Which of the following is not found in protozoan cells?
a. Cell walls
b. Nucleus
c. Mitochondria
d. Cell membrane
Answer: a. Cell walls
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What characteristic do mycoplasmas (Bacteria) and Thermoplasma and Ferroplasma (Archaea) have in common?
A) contain plasmids B) hyperthermophilic C) lack cell walls D) relatively large genomes from duplicated genes
An advantage of the smaller size of prokaryotes, compared to eukaryotes, is
A. high surface area relative to low cell volume. B. more rapid growth rates. C. compartmentalization of cellular processes in membrane-bound organelles. D. predators, parasites, and competitors constantly surround them. E. high surface area relative to low cell volume AND more rapid growth rates.
The pathway for a simple reaction to a stimulus is
a. sense organ, sensory neuron, association neuron, motor neuron, effector. b. sense organ, sensory neuron, motor neuron, association neuron, effector. c. sense organ, motor neuron, sensory neuron, association neuron, effector. d. sense organ, motor neuron, association neuron, sensory neuron, effector.
Which trophic level would contain the lowest quantity of energy (kcal per m2)?
a. secondary consumers b. tertiary consumers c. herbivores d. producers e. primary consumers