The speed of impulse conduction along an axon may be increased by
A) myelin sheaths.
B) graded potentials.
C) neurotransmitters.
D) effector cells.
Answer: A
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For two genes on different chromosomes, the inheritance of one gene does not influence the chance of inheriting the other gene. This is called
A) The law of independent assortment B) The law of segregation C) The mode of inheritance D) A monohybrid cross
Which of the following is NOT a line of evidence that Kingdom Animalia is a monophyletic group?
a. The ribosomal RNA of animals is more similar to that of other animals than it is to any other form of life. b. Animals share unique similarities in their cell-to-cell junctions. c. All animals have the same genetic code. d. Animals share similarities in the molecules in their extracellular matrices. e. All animals have bilateral symmetry.
Tendon sheaths are used to
a. reduce friction. b. protect joints. c. protect muscles. d. attach tendons to each other. e. stabilize joints.
Energy flow in an ecosystem begins with
A. autotrophs. B. detritivores. C. carnivores. D. omnivores. E. herbivores.