Tetrodotoxin blocks voltage-gated sodium channels and ouabain blocks sodium-potassium pumps. If you added both tetrodotoxin and ouabain to a solution containing neural tissue, what responses would you expect?
A) immediate loss of resting potential
B) immediate loss of action potential with gradual loss of resting potential
C) slow decrease of resting potential and action potential amplitudes
D) No effect; the substances counteract each other.
B
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Every population of animals has an age structure. The individuals that make up the population are all
of a specific age, but individuals do not have an age structure. Age structure is an example of a(n) _____.
a. emergent property. b. environmental property. c. hierarchical property. d. organizational property. e. cellular property.
Naturalists were puzzled when they started noticing patterns in morphology, including the presence of body parts with no apparent function. This and other observations made them question what traditional theory?
a. evolution by natural selection b. environmental factors affect traits c. the great chain of being d. limited resources leads to competition e. survival of the fittest
Which of the following is major shortcoming of swimming in South American waters inhabited by candirus?
a. Their behaviour to lead into the urethra of an animal urinating while submerged in water. b. Their behaviour to lead into the anus of an animal while submerged in water. c. Their behaviour to lead into the nose of an animal while swimming in water. d. Their behaviour to lead into the ears of an animal while swimming in water.
Which of the following statements about the oriC region in E. coli is incorrect?
A) It is 245 base pairs in length. B) It is rich in AT base pairs. C) It includes three repeating sequences of 13 base pairs. D) It is directly recognized and bound by DNA helicase. E) It includes five repeating sequences of 9 base pairs.