The spread of an action potential through heart tissue is made possible by

A. gap junctions.
B. tight junctions.
C. a network of neurons in the heart.
D. myogenic junctions.
E. synaptic clefts.


A. gap junctions.

Biology & Microbiology

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Which of the following scientist-discoveries is mismatched?

A. Watson, Crick, Wilkins, and Franklin-DNA structure. B. Avery, MacLeod, and McCarty-DNA is the genetic material. C. Meselson and Stahl-mechanism of DNA replication. D. Griffith-chromosomes.

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Chart the path of molecules of a secreted protein beginning at the DNA for a eukaryote

What will be an ideal response?

Biology & Microbiology

Tetrads fail to separate correctly during anaphase in this process.

a. Crossing-over b. Inversion c. Translocation d. Nondisjunction e. Deletion

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Forensic scientists may have to identify an adult victim who was lost in the wilderness years ago from the remains found by a hiker. What type of evidence from the bones would they look for to determine the age of the person?

A) any broken bones because the bones of the elderly break easily B) the number of bones C) The bones do not yield much information that can help to determine age. D) the size of the bones and the condition of the growth plate

Biology & Microbiology