Question 1

In the lab,you choose to design a simple experiment to distinguish between hydrophilic and hydrophobic substances.You start by adding equal amounts of vinegar and oil to a container.After shaking,the vinegar and oil levels separate,based upon polarity and density.To this you add glucose and sodium citrate and shake again.Where do you expect to find the glucose and sodium citrate in greatest quantities?

Accepted Answer

A) Both will concentrate in the oil layer. 
B) The glucose will concentrate in the vinegar,sodium citrate in the oil. 
C) Both will concentrate in the vinegar layer. 
D) Sodium citrate will concentrate in the vinegar,glucose in the oil. 
E) Both will be uniform throughout both layers.

Question 2

As a protein is being synthesized,the correct folding of the protein is aided by the movement of nonpolar amino acids toward the inner areas of the protein.How can this phenomenon be explained?

Accepted Answer

The answer of As a protein is being synthesized,the correct...

Question 3

The ________ of water is caused by the unequal sharing of electrons between oxygen and hydrogen atoms.

Accepted Answer

The answer of The ________ of water is caused by...

Question 4

The cell membrane can be described most accurately as

Accepted Answer

A) permeable to all small molecules and ions. 
B) impermeable to larger molecules independent of their chemical characteristics. 
C) permeable to some molecules and impermeable to others. 
D) impermeable to all polar molecules. 
E) permeable to all molecules except water.

Question 5

Which of the following biomolecules are long polymers of repeating monomers?

Accepted Answer

A) polysaccharides 
B) nucleic acids 
C) proteins 
D) lipids 
E) polysaccharides,nucleic acids,and proteins

Question 6

________ aid in the assembly of some biomolecules.

Accepted Answer

The answer of ________ aid in the assembly of some...

Question 7

Although energy is ________ for polymerization,most macromolecules fold into their final three-dimensional conformations ________.

Accepted Answer

The answer of Although energy is ________ for polymerization,most macromolecules...

Question 8

Biologically,which of the following is the least important characteristic of water?

Accepted Answer

A) Water molecules are polar. 
B) Water molecules form numerous hydrogen bonds. 
C) Water is a good solvent. 
D) Water typically contains isotopes of hydrogen. 
E) Water has a temperature-stabilizing capacity.

Question 9

The term amphipathic refers to those molecules that are

Accepted Answer

A) hydrophilic. 
B) hydrophobic. 
C) charged at both ends but with opposite charges. 
D) nonpolar at both ends. 
E) charged at one end and nonpolar at the other.

Question 10

Single covalent carbon-carbon bonds have a bond energy of 83 kcal/mol while visible light from the sun has 40-70 kcal of energy per mole of photons.Why is this property of carbon-carbon bonds important for life on earth? Based on this observation,how could the degradation of the earth's atmosphere and an increase in high-energy ultraviolet radiation affect life on earth?

Accepted Answer

The answer of Single covalent carbon-carbon bonds have a bond...

Question 11

The cell membrane is composed of a bilayer of ________.These molecules have regions that are polar and nonpolar and are therefore ________.

Accepted Answer

The answer of The cell membrane is composed of a...

Question 12

Which of the following is not a fundamental property of carbon?

Accepted Answer

A) Carbon-containing molecules are diverse. 
B) Carbon-containing molecules may form stereoisomers. 
C) Carbon-containing molecules are stable. 
D) Carbon has a valence of 4. 
E) Carbon atoms are most likely to form ionic bonds with one another.

Question 13

Self-assembly can be used for which of the following applications?

Accepted Answer

A) nanotechnology 
B) quantum computing 
C) biosensors 
D) drug delivery systems 
E) all of these

Question 14

________ and ________ groups are negatively charged functional groups of carbon,whereas the ________ group is a positively charged functional group.

Accepted Answer

The answer of ________ and ________ groups are negatively charged...

Question 15

Self-assembly of some structures may depend on

Accepted Answer

A) the size of the monomers. 
B) the presence of lipids in the cytosol. 
C) information supplied by preexisting structures. 
D) the time associated with forming noncovalent interactions. 
E) all of the above.

Question 16

Which of the following is not an activated monomer?

Accepted Answer

A) adenosine triphosphate 
B) glucose-6-phosphate 
C) aminoacyl tRNA 
D) amino acid 
E) uracil triphosphate

Question 17

Macromolecules can be assembled into ________ that are components of organelles and other subcellular organelles.

Accepted Answer

The answer of Macromolecules can be assembled into ________ that...

Question 18

Which one of the following biological polymers is mismatched with its monomer?

Accepted Answer

A) DNA - nucleotide 
B) enzyme - amino acid 
C) chitin - monosaccharide 
D) protein - amino acid 
E) cellulose - amino acid

Question 19

Predict whether or not each of the following substances can cross a biological membrane directly.Give a reason for each prediction. a.Nucleotides b.Na⁺ c.Steroid hormones d.Polar amino acids e.Water f.Oxygen g.Cl^?

Accepted Answer

The answer of Predict whether or not each of the...

Question 20

What atom forms the backbone of almost all biological molecules?

Accepted Answer

A) hydrogen 
B) nitrogen 
C) carbon 
D) sulfur 
E) phosphorus

Exam 2: The Chemistry of the Cell

As a protein is being synthesized,the correct folding of the protein is aided by the movement of nonpolar amino acids toward the inner areas of the protein.How can this phenomenon be explained?

The ________ of water is caused by the unequal sharing of electrons between oxygen and hydrogen atoms.

The cell membrane can be described most accurately as

Which of the following biomolecules are long polymers of repeating monomers?

________ aid in the assembly of some biomolecules.

Although energy is for polymerization,most macromolecules fold into their final three-dimensional conformations .

Biologically,which of the following is the least important characteristic of water?

The term amphipathic refers to those molecules that are

The cell membrane is composed of a bilayer of .These molecules have regions that are polar and nonpolar and are therefore .

Which of the following is not a fundamental property of carbon?

Self-assembly can be used for which of the following applications?

and groups are negatively charged functional groups of carbon,whereas the group is a positively charged functional group.

Self-assembly of some structures may depend on

Which of the following is not an activated monomer?

Macromolecules can be assembled into ________ that are components of organelles and other subcellular organelles.

Which one of the following biological polymers is mismatched with its monomer?

Predict whether or not each of the following substances can cross a biological membrane directly.Give a reason for each prediction. a.Nucleotides b.Na⁺ c.Steroid hormones d.Polar amino acids e.Water f.Oxygen g.Cl^?

What atom forms the backbone of almost all biological molecules?

Exam 2: The Chemistry of the Cell

As a protein is being synthesized,the correct folding of the protein is aided by the movement of nonpolar amino acids toward the inner areas of the protein.How can this phenomenon be explained?

The ________ of water is caused by the unequal sharing of electrons between oxygen and hydrogen atoms.

The cell membrane can be described most accurately as

Which of the following biomolecules are long polymers of repeating monomers?

________ aid in the assembly of some biomolecules.

Although energy is ________ for polymerization,most macromolecules fold into their final three-dimensional conformations ________.

Biologically,which of the following is the least important characteristic of water?

The term amphipathic refers to those molecules that are

The cell membrane is composed of a bilayer of ________.These molecules have regions that are polar and nonpolar and are therefore ________.

Which of the following is not a fundamental property of carbon?

Self-assembly can be used for which of the following applications?

________ and ________ groups are negatively charged functional groups of carbon,whereas the ________ group is a positively charged functional group.

Self-assembly of some structures may depend on

Which of the following is not an activated monomer?

Macromolecules can be assembled into ________ that are components of organelles and other subcellular organelles.

Which one of the following biological polymers is mismatched with its monomer?

Predict whether or not each of the following substances can cross a biological membrane directly.Give a reason for each prediction. a.Nucleotides b.Na+ c.Steroid hormones d.Polar amino acids e.Water f.Oxygen g.Cl?

What atom forms the backbone of almost all biological molecules?

Although energy is for polymerization,most macromolecules fold into their final three-dimensional conformations .

The cell membrane is composed of a bilayer of .These molecules have regions that are polar and nonpolar and are therefore .

and groups are negatively charged functional groups of carbon,whereas the group is a positively charged functional group.

Predict whether or not each of the following substances can cross a biological membrane directly.Give a reason for each prediction. a.Nucleotides b.Na⁺ c.Steroid hormones d.Polar amino acids e.Water f.Oxygen g.Cl^?