How do leeches differ from other annelids?
a. They are aquatic.
b. They do not have segmentation.
c. They cannot reproduce sexually.
d. They do not have a nervous system.
e. They do not have setae or parapodia.
e
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A person able to hear only high-frequency sounds would probably have which of the following structural problems in the ear?
A) The tympanum is damaged because of chronic ear infections. B) The basilar membrane is stiffened along its entire length. C) The ear ossicles are abnormally thickened. D) All of these problems could result in inability to detect low-frequency sound.
In a fungus, a complex multicellular reproductive structure is called:a
a hypha. b. a gametangium. c. a fruiting body. d. an oogonium. e. an antheridium
Refer to the accompanying figure. The structure labeled as 7 in the figure of the tryptophan operon is a(n):
a. active repressor protein. b. inactive repressor protein. c. active RNA polymerase. d. inactive RNA polymerase. e. ribosome.
The biological specialty that deals with the reconstruction and study of phylogenies is called ________.
Fill in the blank(s) with the appropriate word(s).