In which condition is the mosaic tissue pattern of females easily observed?
a. psoriasis
b. incontinentia pigmenti
c. ectoderm pigmentation syndrome
d. epithelial aggregate syndrome
e. albinism
ANSWER: b
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Which of the following statements about action potentials is correct?
A) Action potentials for a given neuron vary in magnitude. B) Action potentials for a given neuron vary in duration. C) Action potentials are propagated down the length of the axon. D) Movement of ions during the action potential occurs mostly through the sodium pump.
Protozoans are an important part of the food chain ingesting large numbers of
A. fish. B. bacteria and algae. C. shellfish. D. other protozoans.
The growth of a new plant on the margin of a leaf that eventually falls to the ground and grows
independently is an example of
a. fragmentation. b. protoplast fusion. c. somaclonal section. d. grafting. e. apomixis.
In the diagram below, the gray unit represents _____. The figure shows a blue molecule arranged in the form of a double chain. The gray unit on this figure represents an oval structure which contains unwound and unpaired chains of this molecule. Before and after this unit, the molecule is wound in the form of a double helix. A green unit represents a part of the double helix before the gray unit.
a. RNA b. DNA c. transcription factors d. RNA polymerase e. the promoter