Electrical impulses that stimulate contraction of heart muscles are initiated in the

A) left ventricle.
B) bundle of His.
C) sinoatrial node.
D) atrioventricular node.
E) Purkinje fibers.


C

Biology & Microbiology

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What can be said about Drosophila development?  

A.  Paternal genes determine the initial course of development after fertilization. B.  Zygotic genes determine the initial course of development after fertilization. C.  Maternal genes determine the initial course of development after fertilization. D.  Syncytial blastoderm genes determine the initial course of development after fertilization.

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Describe the active processes (i.e. involving activation and repression mechanisms) and passive processes (i.e. not involving activation and repression mechanisms) of quorum sensing in Vibrio fisheri.

What will be an ideal response?

Biology & Microbiology

The physical appearance of an organism for a given trait is termed:

a. genetics. b. dominance. c. synapsis. d. genotype. e. phenotype.

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Granulomatous amebic encephalitis is caused by

a) Acanthamoeba. b) Naegleria fowleri. c) Trypanosoma brucei. d) Cryptococcus neoformans.

Biology & Microbiology