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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Organisms from two separate species can look anatomically similar

Indicate whether the statement is true or false

Biology & Microbiology