PS#1 - Sept 8 Answers - and protein molecules. What is the...

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1. What is an electrostatic interaction? Give an example. Ans: It is the attractive force of two oppositely charged atoms. Salts (such as NaCl) are a common example. 2. Describe the shape of methane: CH 4 Ans: Methane is tetrahedral and sp 3 hybridized, with bond angles of about 109 ° . 3. What characteristics distinguish living organisms from inanimate objects? Ans: Living organisms (1) are chemically complex and highly organized; (2) extract, transform, and use energy from their environment; (3) have the capacity to precisely self-replicate and self- assemble 4. All cells are surrounded by a plasma membrane composed of lipid
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Unformatted text preview: and protein molecules. What is the function of the plasma membrane? Ans: The plasma membrane acts as a barrier to the free passage of inorganic ions and most other charged or polar compounds into or out of the cell. It contains proteins that can transport specific ions or molecules. Other membrane proteins act as receptors that transmit signals from the outside to the inside of the cell. 5. Which one of the following is not among the four most abundant elements in living organisms? A) Carbon B) Hydrogen C) Nitrogen D) Oxygen E) Phosphate Ans: E...
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This note was uploaded on 01/25/2010 for the course SCIENCE bioc300 taught by Professor Foster during the Spring '10 term at The University of British Columbia.

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