Which factor is important for maintaining the different germ cell layers in the developing embryo? [Hint: without this molecule the embryo would be a ball of cells with no distinct germ cell layers.]
A. activin
B. noggin
C. Spemann's organizer
D. Hox gene
E. cadherins
E. cadherins
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Which of the following is the term for a ball of undifferentiated cells that results from repeated mitosis of a fertilized ovum?
A. cleavage B. blastula C. gastrula D. endoderm
The human genome has a size of approximately
a. 1 billion base pairs b. 3 billion base pairs c. 7 billion base pairs d. 10 billion base pairs e. 14 billion base pairs
Which one of the following is a mismatch between tissue system and function?
a. ground tissue?photosynthesis b. vascular tissue?storage c. dermal tissue?covering of plant body d. ground tissue?storage e. vascular tissue?transport
Organisms from two separate species can look anatomically similar
Indicate whether the statement is true or false