Striated muscle has light and dark bands. The light bands are called ________, whereas the dark bands are called ________.

A) Z lines; M lines
B) H zones; M zones
C) A bands; I bands
D) I bands; A bands
E) M lines; A bands


D) I bands; A bands

Biology & Microbiology

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Action potentials propagate ____

a. towards the cell body b. away from the initiation site c. bidirectional d. towards the dendrites e. away from the synapse

Biology & Microbiology

Which of the following events occurs initially when Escherichia coli cells are in a gradient of a chemorepellent?

A. CheY is phosphorylated B. Cells tumble C. CheA autophosphorylates D. Flagella rotate clockwise

Biology & Microbiology

The size of a population depends on its rates of births, deaths, __________, and __________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

During redox reactions,

A) the loss of electrons from one molecule is called reduction. B) electrons are lost from one substance and added to another substance. C) protons from one molecule replace the electrons lost from another molecule.

Biology & Microbiology