Which of the following is the most likely location of an insulator sequence?
A. At the end of a gene
B. In the middle of a gene
C. At the beginning of a gene
D. Between two genes
E. Within an intron
D
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Why do adult urochordates (tunicates) lack notochords, even though larval urochordates have them? Larvae use notochords to _____
A) aid in swimming; adults are sessile and thus no longer propel themselves. B) stiffen their bodies; in adults, the notochord is replaced by a column of bone. C) induce tissue differentiation; in adults, tissue is already differentiated. D) organize their nervous systems; adults' nervous systems are fully developed and do not change.
What continent was the starting point for the origination of humans?
A. Africa B. Asia C. Europe D. Australia E. North America
Figure 40.3
In the above illustration of fluid regulation in an earthworm, the letter "B" represents which of the following?
A. The excretory pore B. Nephridium tubules C. The storage bladder D. The ureter E. Funnel to collect fluid
If cyanide entered cells, the result would be ______.
a. no ATP molecules could be produced from each glucose molecule b. a net gain of only 2 ATP molecules produced from each glucose molecule c. a net gain of only 4 ATP molecules produced from each glucose molecule d. None of the listed responses is correct.