This animal is a tetrapod that has a cloaca,
aquatic larvae, and is tailless as an adult. This
animal is
a. a salamander.
b. a frog.
c. a tunicate.
d. a lizard.
e. more than one of these.
B
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The normal microbiota of the genital tract of women is
A. affected by estrogen levels. B. dependent on the activity of Lactobacillus. C. unchanging. D. typically composed of Escherichia coli. E. affected by estrogen levels AND dependent on the activity of Lactobacillus.
At rest, neurons exhibit a negative membrane potential. Among the factors that maintain this polarity, assess which is most DIRECTLY responsible for the difference between intracellular and extracellular ion concentrations?
A. movements of negatively charged proteins and nucleic acids across the membrane. B. passive leakage of Na+ ions across the membrane. C. passive leakage of K+ ions across the membrane. D. movement of Na+ ions through voltage-gated Na+ channels. E. movement of K+ ions through voltage-gated K+ channels.
Methanogens are classified as ____
a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. chemotrophs
Why is it important to maintain a collection of wild relatives of crop plants?
a. Humans have a natural urge to collect things. b. It allows future generations to see plants that are gone. c. Seeds are not stable. d. Crop plants do not produce their own seeds. e. It provides insurance in the form of genetic diversity.