The process by which cells become specialized is called _____.
A) differetitation
b) totipotency
c) cloning
d) deseperation
Answer: A) differetitation
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Heart excitation originates in the
a. atrioventricular node. b. intercalated disk. c. sinoatrial node. d. pericardium. e. endothelium.
________ refers to heat from deep underground sources used as a source of energy
Fill in the blank(s) with correct word
Which of the following does not use RNA as the genome?
A. Influenza virus B. Poxvirus C. Poliovirus D. Rabies virus
Photosystems are:
A) arrangements of chloroplasts within the cells lining the surface of leaves. B) the wavelengths of light that reach the earth from the sun. C) arrangements of light-catching pigments within chloroplasts. D) arrangements of thylakoid membranes within the plant cell wall. E) arrangements of ATP-synthase molecules within chloroplasts.