The constricted area where sister chromatids are attached is the ____________________. Fill in the blank(s) with the appropriate word(s)
ANSWER: centromere
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A sea squirt uses its ____ for food collection and gas exchange
a. siphon b. pharynx c. tunic d. mantle e. radula
A human X-linked recessive gene may be
a. found on the Y chromosome. b. passed to daughters from their fathers. c. passed to sons from their mothers. d. expressed more commonly among females. e. passed to daughters from their fathers and passed to sons from their mothers.
Nervous tissue cells that generate and transmit electrical impulses are called glial cells.
a. true b. false
One characteristic that makes Caenorhabditis elegans attractive for developmental studies is:
a. its small, transparent body. b. the extensive number of genes shared with humans. c. the developmental defects that occur in this organism. d. the close evolutionary relationship between this mammal and humans. e. the presence of zygotic segmentation genes, similar to those found in humans.