Why doesn't a tapeworm have a mouth on its scolex?
A. The mouth is on the proglottids.
B. The mouth is located at the end of the pharynx.
C. Tapeworms use a radula instead of a mouth to feed.
D. Endoparasites don't need a mouth.
Answer: D
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Choose the two primary factors that contribute to the resting membrane potential of a neuron.
_____ K+ leak channels make the cell membrane more permeable to K+. _____ The sodium-potassium pump exports 3 K+ from the cell for every 2 Na+ it imports _____ Na+ leak channels make the cell membrane more permeable to Na+. _____ K+ leak channels cause a higher concentration of K+ outside the cell. _____ The sodium-potassium pump exports 3 Na+ from the cell for every 2 K+ it imports
Contraction and relaxation of smooth muscle in the wall(s) of ____ can alter its diameter and air flow
a. alveoli b. bronchioles c. bronchi d. trachea e. larynx
Inducing mutations in a population...
a) is a method of cloning b) increases the genetic variation in the population c) results in organisms with very similar traits d) decreases the genetic variation in the population
All of the following bases are found in RNA molecules EXCEPT
A. adenine. B. thymine. C. uracil. D. cytosine. E. guanine.