Cells lining parts of the respiratory tract have numerous short filamentous structures known as ________ on their surfaces, which beat in unison and move materials through the airways

Fill in the blank(s) with correct word


cilia

Biology & Microbiology

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Which of the following is NOT true of the NMDA receptor?

a. It is an ionotropic receptor. b. It opens channels for both sodium and calcium. c. It is blocked by NBQX. d. It can activate second messengers. e. It is responsive to both glutamate and glycine.

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The insoluble layer of aromatic alcohols that are primarily found in woody tissues are the

A) annulus. B) cadherins. C) proteoglycans. D) lignins. E) pectins.

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What would happen if everyone on the planet used resources and lived the average lifestyle of an American?

A) The Earth would have the carrying capacity to sustain the human population. B) The population growth rate would immediately decrease. C) We would need multiple Earths for this to be possible. D) There would be same number of people in less-developed countries as there are Americans.

Biology & Microbiology

What must pyruvic acid be converted to before it can enter the citric acid cycle?

A) acetyl CoA B) lactic acid C) ethyl alcohol D) citric acid

Biology & Microbiology