Question 1

Neutral fats are

Accepted Answer

A)   stored as glycogen.
B)   not stored.
C)   made of fatty acids and glycerol.
D)   made of chains of fatty acids linked together by water molecules.E) B) and C)
F) B) and D)

Question 2

You eat eggs for breakfast and return in the evening to dirty dishes with "dried on" yellow streaks.After soaking awhile,the egg yolk protein molecules easily "wash off." What happened?

Accepted Answer

A)   Heating denatured the egg protein molecules, hydrolysis reactions then formed bonds in the dried egg yolk, and soaking in water eventually resulted in condensation reactions where water broke these bonds
B)   Heating denatured the egg protein molecules, unorganized condensation reactions formed bonds in the drying egg, and soaking in water resulted in hydrolysis reactions where water broke these bonds
C)   Egg monomers were fused to become one polymer, which was easily dissolved by water back into monomers
D)   Addition of water converted organic molecules into inorganic moleculesE) A) and B)
F) A) and C) B

Question 3

The alpha helix is found at which level of protein organization?

Accepted Answer

A)   Primary structure
B)   Secondary structure
C)   Tertiary structure
D)   Quaternary structureE) A) and C)
F) A) and B)

Question 4

The most important of the energy-storing carbohydrate monomers is the molecule _______________.

Accepted Answer

The answer of The most important of the energy-storing carbohydrate...

Question 5

Which of these statements is true about DNA?

Accepted Answer

A)   It is the genetic material of the cell
B)   It forms a protein
C)   It is pure amino acid
D)   It contains no sugarE) A) and B)
F) All of the above

Question 6

Fish sperm is mostly made of male DNA.A chemical test would find high amounts of

Accepted Answer

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) C) and D)
G) B) and E)

Question 7

Describe the chicken-or-the-egg dilemma with enzymes and hereditary molecules,and detail how the "RNA world" proposal offers a solution.

Accepted Answer

The chicken-or-the-egg dilemma in the co...

Question 8

Which of the carbohydrates given below is a major component of the cuticle of arthropods (e.g.,insects,crayfish,etc.) ?

Accepted Answer

A)   Starch
B)   Chitin
C)   Cellulose
D)   GlycogenE) A) and B)
F) A) and C) B

Question 9

Biological evolution differs from chemical evolution in that biological evolution would have been possible only after the development of

Accepted Answer

A)   true cells capable of replication.
B)   nucleic acids.
C)   enzymes.
D)   a metabolic pathway.E) A) and D)
F) A) and C)

Question 10

The three principal groups of lipids are neutral fats,phospholipids,and

Accepted Answer

A)   glycogen.
B)   steroids.
C)   amino acids.
D)   fatty acids.E) C) and D)
F) A) and B)

Question 11

Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Accepted Answer

A)   Water vapor (H2O) 
B)   Carbon dioxide (CO2) 
C)   Oxygen (O2) 
D)   Nitrogen (N2) E) All of the above
F) A) and B) C

Question 12

Which of the following is NOT a steroid?

Accepted Answer

A)   Vitamin D
B)   Adrenocortical hormones
C)   Sex hormones
D)   Cholesterol
E)   All of the choices are steroidsF) A) and D)
G) None of the above

Question 13

Which of the following is a correct statement about oxidation reduction reactions?

Accepted Answer

A)   Reduction is the loss of electrons
B)   Reduction is the loss of hydrogen atoms
C)   Oxidation is the loss of electrons or hydrogen atoms
D)   Reduction and oxidation sometimes occur together, but not alwaysE) None of the above
F) All of the above

Question 14

A chain consisting of a number of amino acids is a

Accepted Answer

A)   quaternary structure.
B)   dipeptide.
C)   polypeptide.
D)   None of the choices are correct.E) B) and C)
F) All of the above

Question 15

What evidence leads researchers to believe that there was a diversity of animal life before the Cambrian if we cannot find extensive fossils of earlier animals?

Accepted Answer

The belief that there was a diversity of...

Question 16

Pasteur's work with spontaneous generation showed that

Accepted Answer

A)   life could not have evolved from non-living chemistry on the early earth.
B)   mice came from mother mice and maggots from mother flies.
C)   simple chemicals could become complex organic macromolecules without any living cell involved.
D)   broth did not ferment spontaneously but required contamination with organisms.E) A) and D)
F) A) and C)

Question 17

The earliest source of reduced compounds for oxidative metabolism was probably ____________ _____________.

Accepted Answer

The answer of The earliest source of reduced compounds for...

Question 18

Carbohydrates are categorized into

Accepted Answer

A)   organic and inorganic carbohydrates.
B)   saturated and unsaturated carbohydrates.
C)   monosaccharides, disaccharides and polysaccharides.
D)   primary, secondary, tertiary and quaternary carbohydrates.
E)   monomer and polymer carbohydrates.F) A) and B)
G) A) and C)

Question 19

Which pairing of occurrence and date is correct?

Accepted Answer

A)   Beginning of Cambrian - 600 million years ago
B)   Origin of life - 3.8 billion years ago
C)   Origin of eukaryotic cells - 1.5 billion years ago
D)   All the choices are correctE) C) and D)
F) B) and C)

Question 20

A nucleic acid is a polymer made up of which kind of monomers?

Accepted Answer

A)   Amino acids
B)   Nucleotides
C)   Glucose or modified glucose molecules
D)   Alternating sugar and phosphate groupsE) B) and D)
F) B) and C)

Exam 2: The Origin and Chemistry of Life

Neutral fats are

Correct AnswerverifiedShow Answer

You eat eggs for breakfast and return in the evening to dirty dishes with "dried on" yellow streaks.After soaking awhile,the egg yolk protein molecules easily "wash off." What happened?

Correct AnswerverifiedB

The alpha helix is found at which level of protein organization?

Correct AnswerverifiedShow Answer

The most important of the energy-storing carbohydrate monomers is the molecule _______________.

Correct AnswerverifiedShow Answer

Which of these statements is true about DNA?

Correct AnswerverifiedShow Answer

Fish sperm is mostly made of male DNA.A chemical test would find high amounts of

Correct AnswerverifiedShow Answer

Describe the chicken-or-the-egg dilemma with enzymes and hereditary molecules,and detail how the "RNA world" proposal offers a solution.

Correct AnswerAnswered by ExamLex AIThe chicken-or-the-egg dilemma in the co...View AnswerShow Answer

Which of the carbohydrates given below is a major component of the cuticle of arthropods (e.g.,insects,crayfish,etc.) ?

Correct AnswerverifiedB

Biological evolution differs from chemical evolution in that biological evolution would have been possible only after the development of

Correct AnswerverifiedShow Answer

The three principal groups of lipids are neutral fats,phospholipids,and

Correct AnswerverifiedShow Answer

Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Correct AnswerverifiedC

Which of the following is NOT a steroid?

Correct AnswerverifiedShow Answer

Which of the following is a correct statement about oxidation reduction reactions?

Correct AnswerverifiedShow Answer

A chain consisting of a number of amino acids is a

Correct AnswerverifiedShow Answer

What evidence leads researchers to believe that there was a diversity of animal life before the Cambrian if we cannot find extensive fossils of earlier animals?

Correct AnswerAnswered by ExamLex AIThe belief that there was a diversity of...View AnswerShow Answer

Pasteur's work with spontaneous generation showed that

Correct AnswerverifiedShow Answer

The earliest source of reduced compounds for oxidative metabolism was probably ____________ _____________.

Correct AnswerverifiedShow Answer

Carbohydrates are categorized into

Correct AnswerverifiedShow Answer

Which pairing of occurrence and date is correct?

Correct AnswerverifiedShow Answer

A nucleic acid is a polymer made up of which kind of monomers?

Correct AnswerverifiedShow Answer

Correct Answer
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B

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Answered by ExamLex AI
The chicken-or-the-egg dilemma in the co...
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B

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C

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Answered by ExamLex AI
The belief that there was a diversity of...
View Answer

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The earliest source of reduced compounds for oxidative metabolism was probably _.

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