How many hydrogen bonds are present between cytosine and guanine (C and G)?
A) 1
B) 2
C) 3
D) 4
Ans: C) 3
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Organisms that derive their energy and carbon from organic compounds are __________
A. photoautotrophs B. chemoheterotrophs C. photoheterotrophs D. chemoautotrophs E. chemolithotrophs
The domain (domains) that contain prokaryotes is (are)
A. Archaea. B. Bacteria. C. both Archaea and Bacteria. D. Eukarya. E. both Bacteria and Eukarya.
Bacterial fermentation of sugars usually results in ___________ end products whereas breakdown of proteins and amino acids results in the formation of __________ end products.
a - acidic........alkaline b - acidic......alcoholic c - alkaline........acidic d - alkaline.......sulfide d - alcohol........acidic
The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called ________.
A. facilitated diffusion B. active transport C. osmosis D. passive diffusion