____ in heart muscle tissue allows for communication between the cells resulting in the coordinated
beating of the heart.
a. Tight junctions
b. Desmosomes
c. Adherens junctions
d. Anchoring junctions
e. Gap junctions
E
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A carpel is the
(a) same as a megasporophyll. (b) structure producing pollen grains. (c) component making up the anther. (d) synonym for microsporophyll.
What limits the frequency of action potentials?
A. chloride ions B. spike amplitude C. nodes of Ranvier D. refractory period
Which of the following terms is most inclusive?
a. population b. biosphere c. community d. organism
Your friend read an article on the internet today about a new single-celled organism that has been discovered by scientists in Africa. She said the organism is the size of a mouse, and lives in freshwater streams. You tell her to check the source because you think she has read a hoax. How do you know?
1.Because an organism of that size would have been discovered years before now. 2.Single-celled organisms can’t survive in fresh water. 3.A single-celled organism could not attain that size. They are limited by surface-to-volume ratio. 4.There would have to be many more than one, since cells must come from other cells. If they only collected one, it must be a hoax.