How many hydrogen bonds are present between cytosine and guanine (C and G)?

A) 1
B) 2
C) 3
D) 4


Ans: C) 3

Biology & Microbiology

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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

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The domain (domains) that contain prokaryotes is (are)

A. Archaea. B. Bacteria. C. both Archaea and Bacteria. D. Eukarya. E. both Bacteria and Eukarya.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology