Question 1

Which types of bonds might be involved in the following: DNA double helix, folding of a protein, protein binding to DNA, protein-protein interactions?

Accepted Answer

DNA double helix-covalent (phosphodieste...

Question 2

You spill a little bit of olive oil on your hands. You wash off the oil with soap and water. How does the soap get the oil off your hands?

Accepted Answer

A)  The hydrophilic part of soap interacts with the oil and sequesters it.
B)  The hydrophobic part of soap interacts with the oil and sequesters it.
C)  The soap dissolves the oil.
D)  The soap makes the water and oil interact in such a way that it dissolves the oil.

Question 3

Explain why an atom that is NOT an ion is electrically neutral.

Accepted Answer

In an atom that is not an ion,...

Question 4

Recall that a carbon atom behaves as if it possesses four valence electrons. Given this information, what is the MOST likely structural formula for carbon dioxide (CO2) ?

Accepted Answer

A)  	O¾C¾O
B)  	O=C=O
C)  	O=C¾O
D)  	O¾C=O

Question 5

The cells that arose on early Earth from primordial reactions are strikingly similar to animal cells of today.

Accepted Answer

A) True 
 B)False

Question 6

The most common isotope of oxygen has 8 protons and an atomic mass of 16. How many neutrons are present in the oxygen nucleus?

Accepted Answer

A)  2
B)  4
C)  6
D)  8
E)  10

Question 7

Which of the following ranks the elements carbon, sodium, calcium, and iodine in order of decreasing number of energy shells/levels?

Accepted Answer

A)  CNaCaI
B)  ICaNaC
C)  ICCaNa
D)  CCaNI

Question 8

Helicase is an enzyme that separates the double helix of the DNA into two separate strands. How do you think helicase does this?

Accepted Answer

A)  by breaking hydrogen bonds
B)  by breaking phosphodiester bonds
C)  by breaking peptide bonds
D)  by breaking ionic bonds

Question 9

The basic unit of matter is referred to as a(n) _____.

Accepted Answer

The answer of The basic unit of matter is referred...

Question 10

A pair of atoms joined by a polar covalent bond:

Accepted Answer

A)  has the charge spread evenly across both atoms.
B)  has a slight positive charge on one atom and a slight negative charge on the other.
C)  is unlikely to form hydrogen bonds with water.
D)  mixes well with nonpolar solvents.

Question 11

A researcher has measured the pH of a solution, and found that the pH is 10. This solution is _____, and has more _____ compared with _____.

Accepted Answer

A)  basic; protons; hydroxide ions
B)  basic; hydroxide ions; protons
C)  acidic; protons; hydroxide ions
D)  acidic; hydroxide ions; protons
E)  neutral; hydroxide ions; protons

Question 12

It is believed that the surfaces upon which the first nucleic acids were able to form were made of:

Accepted Answer

A)  limestone.
B)  clay.
C)  granite.
D)  diamond.
E)  sand.

Question 13

Which of the following statements is TRUE regarding carbon?

Accepted Answer

A)  Carbon atoms can only form single covalent bonds with other carbon atoms.
B)  Double bonds that form between carbon atoms are only found in "ring" molecules.
C)  Isomers of carbon-containing compounds always have the same structure but different chemical formulas.
D)  When a carbon atom forms a molecule, it acquires four dumbbell-shaped orbitals.
E)  None of the other answer options is correct.

Question 14

Single covalent bonds between carbon atoms:

Accepted Answer

A)  allow free rotation of the carbon atoms around the bond.
B)  are strong enough to support long chains of carbon atoms.
C)  allow a molecule to twist and turn into many different arrangements.
D)  All of these choices are correct.

Question 15

The association of individual water molecules with other water molecules is called _____ and occurs through _____ bonds between water molecules.

Accepted Answer

A)  adhesion; polar covalent
B)  cohesion; polar covalent
C)  cohesion; hydrogen bonds
D)  adhesion; hydrogen bonds

Question 16

A young girl is staring at the raindrops running down her window. She notices that the raindrops remain more or less intact, even as they cascade down the windowpane. This is a result of:

Accepted Answer

A)  covalent bonds between water molecules.
B)  oxygen bonds between water molecules.
C)  polar covalent bonds between water molecules.
D)  hydrogen bonds between water molecules.
E)  ionic bonds between water molecules.

Question 17

Which of the following is an example of a hydrogen bond?

Accepted Answer

A)  the bond that forms between a hydrogen and oxygen atom within the same water molecule
B)  the bond that forms between two hydrogen atoms within the same water molecule
C)  the bond that forms between hydrogen and oxygen atoms within different water molecules
D)  the bond that forms between two hydrogen atoms within different water molecules
E)  the bond that forms between two oxygen atoms within different water molecules

Question 18

What is the chemical basis for water's role as the universal solvent?

Accepted Answer

Because water is pol...

Question 19

Samples of three different triacylglycerols were tested to determine the melting point of each one. The results of the tests are shown in the graph.  The length of the fatty acids A, B, and C is the same. Which of the three triacylgcerols is likely to have the MOST double bonds in the fatty acids?

Accepted Answer

A)  A
B)  B
C)  C
D)  There is no way of knowing based on the information available.

Question 20

Which of the following statements is TRUE regarding elements?

Accepted Answer

A)  Elements are composed of several different types of atoms.
B)  Elements are only found in nature and cannot be created by humans.
C)  Elements are still categorized according to Aristotle's early classifications.
D)  Elements are composed of only one type of atom.
E)  Elements are only found in inorganic substances and not in living organisms.

Exam 2: The Molecules of Life

What is the chemical basis for water's role as the universal solvent?

Correct AnswerverifiedBecause water is pol...View AnswerShow Answer

A young girl is staring at the raindrops running down her window. She notices that the raindrops remain more or less intact, even as they cascade down the windowpane. This is a result of:

Correct AnswerverifiedShow Answer

The cells that arose on early Earth from primordial reactions are strikingly similar to animal cells of today.

Correct AnswerverifiedShow Answer

Recall that a carbon atom behaves as if it possesses four valence electrons. Given this information, what is the MOST likely structural formula for carbon dioxide (CO2) ?

Correct AnswerverifiedShow Answer

Helicase is an enzyme that separates the double helix of the DNA into two separate strands. How do you think helicase does this?

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE regarding carbon?

Correct AnswerverifiedShow Answer

A pair of atoms joined by a polar covalent bond:

Correct AnswerverifiedShow Answer

Which of the following is an example of a hydrogen bond?

Correct AnswerverifiedShow Answer

The association of individual water molecules with other water molecules is called _____ and occurs through _____ bonds between water molecules.

Correct AnswerverifiedShow Answer

The most common isotope of oxygen has 8 protons and an atomic mass of 16. How many neutrons are present in the oxygen nucleus?

Correct AnswerverifiedShow Answer

Single covalent bonds between carbon atoms:

Correct AnswerverifiedShow Answer

It is believed that the surfaces upon which the first nucleic acids were able to form were made of:

Correct AnswerverifiedShow Answer

Samples of three different triacylglycerols were tested to determine the melting point of each one. The results of the tests are shown in the graph. The length of the fatty acids A, B, and C is the same. Which of the three triacylgcerols is likely to have the MOST double bonds in the fatty acids?

Correct AnswerverifiedShow Answer

Explain why an atom that is NOT an ion is electrically neutral.

Correct AnswerverifiedIn an atom that is not an ion,...View AnswerShow Answer

The basic unit of matter is referred to as a(n) _____.

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE regarding elements?

Correct AnswerverifiedShow Answer

Which of the following ranks the elements carbon, sodium, calcium, and iodine in order of decreasing number of energy shells/levels?

Correct AnswerverifiedShow Answer

A researcher has measured the pH of a solution, and found that the pH is 10. This solution is _____, and has more _____ compared with _____.

Correct AnswerverifiedShow Answer

You spill a little bit of olive oil on your hands. You wash off the oil with soap and water. How does the soap get the oil off your hands?

Correct AnswerverifiedShow Answer

Which types of bonds might be involved in the following: DNA double helix, folding of a protein, protein binding to DNA, protein-protein interactions?

Correct AnswerverifiedDNA double helix-covalent (phosphodieste...View AnswerShow Answer

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Because water is pol...
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Recall that a carbon atom behaves as if it possesses four valence electrons. Given this information, what is the MOST likely structural formula for carbon dioxide (CO₂) ?

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The association of individual water molecules with other water molecules is called _ and occurs through _ bonds between water molecules.

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In an atom that is not an ion,...
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A researcher has measured the pH of a solution, and found that the pH is 10. This solution is ___, and has more _ compared with ___.

Correct Answer
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DNA double helix-covalent (phosphodieste...
View Answer