What are the most common cells that line the surface of the alveoli and are therefore associated with the exchange of gases within the lungs?
A) macrophages
B) goblet cells
C) type I alveolar cells
D) type II alveolar cells
E) type III alveolar cells
Answer: C) type I alveolar cells
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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.
A(n) ____ is a group of functionally related genes transcribed as a polycistronic mRNA from a single promoter to a single terminator
Help with this please?
How long does it take a sperm to reach the
oviduct?
a. 3 minutes b. 30 minutes c. 3 hours d. 3 days e. 30 days
Desert plants often have
A. broad leaves. B. thick vines. C. long taproots. D. shallow roots. E. soft bark.