Biochemistry 210 final exam test 2..docx

Biochemistry 210 final exam test 2.

T/F nitrogen is called the superglue of the chemical world - ANS >> false
B B B B B B B B B B B B B




T/F large elements, such as strontium, are common in biomolecules - ANS >> false
B B B B B B B B B B B B B




T/F the time it takes for a compound to flow through a metabolic pathway is called the payoff phase -
B B B B B B B B B B B B B B B B B B B




B ANS >> false B B




T/F proteins, carbohydrates, and fats all get broken down into acetyl-CoA - ANS >> true
B B B B B B B B B B B B B B




T/F a fat is a lipid molecule that is a solid at room temperature - ANS >> true
B B B B B B B B B B B B B B B B B




in DNA, guanine always pairs with ____
B B B B B B




A. thymine
B




B. guanine
B




C. uracil
B




D. cytosine
B




E. both A and B - ANS >> D. cytosine
B B B B B B B B B




water is considered a polar solvent due to attractive forces known as hydrogen bonds. a hydrogen
B B B B B B B B B B B B B B B




B bond is _____ B B




A. a bond that is stronger than a covalent bond
B B B B B B B B B




B. an attractive force between molecules where partially positive hydrogen atoms are attracted to
B B B B B B B B B B B B B




B partially negative atoms of F, O, or N
B B B B B B B




C. the polar O-H bond in water
B B B B B B




D. an ionic bond between H and another atom
B B B B B B B B




E. a covalent bond between H and O - ANS >> B. an attractive force between molecules where
B B B B B B B B B B B B B B B B B




B partially positive hydrogen atoms are attracted to partially negative atoms of F, O, or N
B B B B B B B B B B B B B B

, what is a unique molecule. which of the following contributes to water's unique place in the chemical
B B B B B B B B B B B B B B B B




B world?

A. the geometry of the molecule
B B B B B




B. the polarity of the O-H bonds
B B B B B B




C. the ability of water molecules to hydrogen bond
B B B B B B B B




D. the bond angle of water
B B B B B




E. all of the answers are correct - ANS >> E. all of the answers are correct
B B B B B B B B B B B B B B B B




the H+ concentration of a solution is 7.9x10^-13M. what is the pH?
B B B B B B B B B B B




A. -6.70B




B. 6.70 B




C. 11.17B




D. -12.1B




E. 12.1 - ANS >> E. 12.1
B B B B B B




which of the following is the enthalpy change of a reaction?
B B B B B B B B B B




A. delta G
B B




B. delta S
B B




C. delta H
B B




D. delta F
B B




E. none of the above - ANS >> C. delta H
B B B B B B B B B B




a globular protein is an example of a protein _____
B B B B B B B B B




A. motifB




B. conformation
B




C. secondary structure
B B




D. quaternary structure
B B