The heart, muscles, bones, and blood develop primarily from:

a. ectoderm
b. mesoderm
c. endoderm
d. the placenta
e. the yolk sac


b

Biology & Microbiology

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Phospholipase C hydrolyzes a membrane phospholipid to produce ____

A. IP3 only. B. protein kinase C only. C. diacylglycerol only. D. both IP3 and protein kinase C. E. both IP3 and diacylglycerol.

Biology & Microbiology

What kind of phylogenetic tree has a single lineage at the base?

What will be an ideal response?

Biology & Microbiology

The worldwide die-off of frogs has been traced to infection by

A) zygomycetes. B) ascomycetes. C) basidiomycetes. D) glomeromycetes. E) chytrids.

Biology & Microbiology

Voluntary muscle control is one of functions of the

A) cerebellum. B) cerebrum. C) spinal cord. D) brain stem. E) meninges.

Biology & Microbiology