You find a wormlike arthropod with a flattened body and carnivorous eating habits. It would most likely be identified
as a ____.
a. Crustacean
b. Millipede
c. Spider
d. Trilobite
e. Centipede
ANSWER: e
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Knockin mice can be created using the Cre/loxP system. In this procedure, the loxP sites are used to
A) delete the neomycin-resistance marker gene. B) recombine the mutation into the genome. C) express Cre protein. D) flip the orientation of genomic DNA after the mutation is inserted.
Some ions move across a membrane using ion channel proteins that are open all the time. Others use _____ ion channel proteins which have the ability to open and close
Fill in the blank(s) with the appropriate word(s).
During mitosis, the rate of microtubule turnover
a. decreases. b. stays the same. c. doubles. d. increases five- to tenfold.
The largest reservoir of water is the ____
a. oceans b. polar ice and glaciers c. groundwater d. lakes and rivers e. atmosphere