Question 1

How many hydrogen atoms are present in a hydrocarbon chain of five carbon atoms with one double bond and the rest single bonds?

Accepted Answer

A)  6
B)  8
C)  10
D)  12E) All of the above
F) A) and D)

Question 2

Pyrimidine and purine bases are found in:

Accepted Answer

A)  nucleic acids.
B)  carbohydrates.
C)  lipids.
D)  fatty acids.
E)  proteins.F) B) and C)
G) A) and E)

Question 3

Rank the elements carbon, phosphorus, calcium, and iodine in order of greatest abundance in living organisms.

Accepted Answer

C<font face="symbol"></font>PF1...

Question 4

Hydrogen bonding is ultimately due to differences in _____ between two atoms.

Accepted Answer

The answer of Hydrogen bonding is ultimately due to differences...

Question 5

The bacteria found in present-day oceans closely resemble those that existed in Earth's early history.

Accepted Answer

A) True 
 B)False

Question 6

What would happen to an atom's atomic mass and electric charge if it gained or lost a proton, a neutron, or an electron?

Accepted Answer

If an atom:gained a proton, its atomic m...

Question 7

Explain why DNA was probably NOT the genetic (information storage) molecule for the first cells.

Accepted Answer

DNA is a very complex molecule, which is...

Question 8

Refer to the periodic table, and decide which of the following molecules is held together by ionic bonds. 3 B) CO2 C) KCl" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  NH3
B)  CO2
C)  KClD) B) and C)
E) A) and C)

Question 9

Which of the following statements is TRUE regarding nucleic acids?

Accepted Answer

A)  Nucleic acids cannot form spontaneously; the first nucleic acids were most likely "built" by early proteins.
B)  Nucleic acids can form spontaneously, provided that an adequate number of nucleotides are available.
C)  Early nucleic acids were likely formed spontaneously and could not have formed complementary strands.
D)  None of the other answer options is correct.E) C) and D)
F) All of the above

Question 10

The ability of atoms to form bonds is due largely to electrons farthest from the nucleus. These electrons are called _____ electrons.

Accepted Answer

The answer of The ability of atoms to form bonds...

Question 11

Which of the following gases did Stanley Miller NOT use in his experiment to recapitulate the Earth's early atmosphere?

Accepted Answer

A)  oxygen gas (O2) 
B)  water vapor (H2O) 
C)  ammonia (NH3) 
D)  hydrogen gas (H2) 
E)  methane (CH4) F) A) and C)
G) A) and E)

Question 12

Consider the two elements, sodium (Na)  and magnesium (Mg) , which occupy the same row in the periodic table of elements. Sodium and magnesium atoms have:

Accepted Answer

A)  a different number of orbitals.
B)  the same atomic number.
C)  different atomic masses.
D)  the same number of electrons in their outermost orbitals.
E)  different atomic masses and the same number of electrons in their outermost orbitals.F) A) and B)
G) C) and D)

Question 13

Although monosaccharides can exist in linear form, virtually all cellular monosaccharides are found in circular form.

Accepted Answer

A) True 
 B)False

Question 14

Which one of the following nucleotides could base pair with a pyrimidine?

Accepted Answer

A)  uracil
B)  cytosine
C)  adenine
D)  thymine
E)  All of these choices are correct.F) A) and C)
G) A) and B)

Question 15

What important feature(s) of noncovalent bonds make(s) them so important to life?

Accepted Answer

They are weak in a c...

Question 16

Sucrose is composed of:

Accepted Answer

A)  two ketose sugars.
B)  a six-carbon sugar and a five-carbon sugar.
C)  a simple sugar and a nucleotide.
D)  an aldose and a ketose.
E)  glycerol and three fatty acids.F) C) and D)
G) A) and B)

Question 17

When two atoms form a covalent bond, they share electrons from all of their orbitals. All of their orbitals, in turn, combine to form a single molecular orbital.

Accepted Answer

A) True 
 B)False

Question 18

Where is the highest-energy electron found in an atom of hydrogen?

Accepted Answer

A)  in the spherical orbital closest to the nucleus
B)  in the second spherical orbital, a little farther from the nucleus
C)  in the dumbbell-shaped orbital of the y-axis
D)  in the dumbbell-shaped orbital of the x-axis
E)  in the dumbbell-shaped orbital of the z-axisF) A) and B)
G) A) and E)

Question 19

Rank the elements carbon, phosphorus, calcium, and iodine in order of decreasing number of valence electrons.

Accepted Answer

I<font face="symbol"></font>PF1...

Question 20

Which statement BEST describes an effect of the low density of frozen water in a lake?

Accepted Answer

A)  When water freezes, it contracts, decreasing the water level in the lake.
B)  Water in a lake freezes from the bottom up, killing most aquatic organisms.
C)  When water in a lake freezes, it floats, providing insulation for organisms below the ice.
D)  Water removes thermal energy from the land around a lake, causing the lake to freeze.E) A) and D)
F) A) and C)

Exam 2: The Molecules of Life

What important feature(s) of noncovalent bonds make(s) them so important to life?

Correct AnswerverifiedThey are weak in a c...View AnswerShow Answer

Refer to the periodic table, and decide which of the following molecules is held together by ionic bonds.

Correct AnswerverifiedShow Answer

Sucrose is composed of:

Correct AnswerverifiedShow Answer

Although monosaccharides can exist in linear form, virtually all cellular monosaccharides are found in circular form.

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE regarding nucleic acids?

Correct AnswerverifiedShow Answer

Which statement BEST describes an effect of the low density of frozen water in a lake?

Correct AnswerverifiedShow Answer

How many hydrogen atoms are present in a hydrocarbon chain of five carbon atoms with one double bond and the rest single bonds?

Correct AnswerverifiedShow Answer

What would happen to an atom's atomic mass and electric charge if it gained or lost a proton, a neutron, or an electron?

Correct AnswerverifiedIf an atom:gained a proton, its atomic m...View AnswerShow Answer

Rank the elements carbon, phosphorus, calcium, and iodine in order of greatest abundance in living organisms.

Correct AnswerverifiedCPF1...View AnswerShow Answer

Pyrimidine and purine bases are found in:

Correct AnswerverifiedShow Answer

Which of the following gases did Stanley Miller NOT use in his experiment to recapitulate the Earth's early atmosphere?

Correct AnswerverifiedShow Answer

The ability of atoms to form bonds is due largely to electrons farthest from the nucleus. These electrons are called _____ electrons.

Correct AnswerverifiedShow Answer

Explain why DNA was probably NOT the genetic (information storage) molecule for the first cells.

Correct AnswerverifiedDNA is a very complex molecule, which is...View AnswerShow Answer

Where is the highest-energy electron found in an atom of hydrogen?

Correct AnswerverifiedShow Answer

Consider the two elements, sodium (Na) and magnesium (Mg) , which occupy the same row in the periodic table of elements. Sodium and magnesium atoms have:

Correct AnswerverifiedShow Answer

Which one of the following nucleotides could base pair with a pyrimidine?

Correct AnswerverifiedShow Answer

Rank the elements carbon, phosphorus, calcium, and iodine in order of decreasing number of valence electrons.

Correct AnswerverifiedIPF1...View AnswerShow Answer

When two atoms form a covalent bond, they share electrons from all of their orbitals. All of their orbitals, in turn, combine to form a single molecular orbital.

Correct AnswerverifiedShow Answer

The bacteria found in present-day oceans closely resemble those that existed in Earth's early history.

Correct AnswerverifiedShow Answer

Hydrogen bonding is ultimately due to differences in _____ between two atoms.

Correct AnswerverifiedShow Answer

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They are weak in a c...
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If an atom:gained a proton, its atomic m...
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CPF1...
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DNA is a very complex molecule, which is...
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IPF1...
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