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The alpha helix and beta sheet are found at which level of protein organization?


A) primary structure
B) secondary structure
C) tertiary structure
D) quaternary structure

E) B) and C)
F) B) and D)

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If a segment of DNA has 20% adenine in its base composition,what percent thymine is there?


A) 20%
B) 80%
C) 60%
D) 30%

E) A) and B)
F) None of the above

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A polysaccharide is a polymer made up of which kind of monomers?


A) simple sugars
B) amino acids
C) nucleotides
D) alternating sugar and phosphate groups
E) fatty acids and glycerol

F) D) and E)
G) C) and D)

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The lipids of the cell membrane and the lipids found in butter and vegetable oil differ in which of the following?


A) the number of fatty acids attached to the glycerol molecule
B) the glycerol molecule
C) the carbon to carbon bonds
D) lipids of the cell membrane do not have hydrophobic sections of the molecule

E) B) and D)
F) A) and C)

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Below freezing and above boiling,cells are unable to function as "liquid machinery." However,most organisms' cells are still limited from functioning throughout this full range of liquid temperatures.At the molecular level in different organisms,cells' ability to vary in their tolerance to temperature,etc.,is most closely related to variation in


A) enzyme activity and protein denaturation.
B) ATP efficiency.
C) ability to form glucose polymers.
D) replication of nucleic acids.
E) extent of saturation of fatty acids.

F) B) and E)
G) B) and C)

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Fish sperm is composed mostly of the male fish's DNA.If we tested a sample chemically,we should find relatively high amounts of


A) nitrogenous bases,sugar,and phosphate groups.
B) phospholipids and steroids.
C) amino acids and unsaturated fats.
D) triglycerides and ATP.
E) globular proteins and stored fats.

F) None of the above
G) B) and E)

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A lipid is a polymer made up of which kind of monomers?


A) glucose or modified glucose molecules
B) amino acids
C) nucleotides
D) alternating sugar and phosphate groups
E) fatty acids and glycerol

F) A) and B)
G) B) and C)

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The reactivity of an organic molecule is primarily dependent upon ____________ of the molecule.


A) the carbon skeleton
B) the attached functional groups such as a hydroxyl group
C) the isomer
D) All of the choices are correct.

E) A) and D)
F) A) and C)

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