Question 1

Structural proteins

Accepted Answer

A) are found in hair and tendons. 
B) include ovalbumin,a protein found in egg white. 
C) include receptor molecules. 
D) include hemoglobin. 
A) are found in hair and tendons. 
B) include ovalbumin,a protein found in egg white. 
C) include receptor molecules. 
D) include hemoglobin.

Question 2

Which of the following statements regarding nucleotides is false?

Accepted Answer

A) Nucleotides can be linked together to form nucleic acids. 
B) Nucleotides contain lipids. 
C) Nucleotides contain sugar molecules. 
D) Nucleotides contain nitrogenous bases. 
A) Nucleotides can be linked together to form nucleic acids. 
B) Nucleotides contain lipids. 
C) Nucleotides contain sugar molecules. 
D) Nucleotides contain nitrogenous bases.

Question 3

A scientist suspects that the food in an ecosystem may have been contaminated with radioactive nitrogen over a period of months.Which of the following substances could be examined for radioactivity to test the hypothesis?

Accepted Answer

A) the sugars produced during photosynthesis by plants growing in the ecosystem 
B) the hair produced by humans living in the ecosystem 
C) the cholesterol in the cell membranes of organisms living in the ecosystem 
D) the cell walls of plants growing in the ecosystem 
A) the sugars produced during photosynthesis by plants growing in the ecosystem 
B) the hair produced by humans living in the ecosystem 
C) the cholesterol in the cell membranes of organisms living in the ecosystem 
D) the cell walls of plants growing in the ecosystem

Question 4

What is the general function of enzymes within a cell?

Accepted Answer

A) to speed up chemical reactions 
B) to stop chemical reactions 
C) to induce chemical reactions 
D) to promote the synthesis of monomers 
A) to speed up chemical reactions 
B) to stop chemical reactions 
C) to induce chemical reactions 
D) to promote the synthesis of monomers

Question 5

The primary structure of a protein is

Accepted Answer

A) composed of two or more polypeptide chains. 
B) an a helix or a pleated sheet. 
C) the amino acid sequence of the polypeptide chain. 
D) maintained by hydrogen bonds. 
A) composed of two or more polypeptide chains. 
B) an a helix or a pleated sheet. 
C) the amino acid sequence of the polypeptide chain. 
D) maintained by hydrogen bonds.

Question 6

Proteins differ from one another because

Accepted Answer

A) the peptide bonds linking amino acids differ from protein to protein. 
B) each protein contains its own unique sequence of sugar molecules. 
C) the sequence of amino acids in the polypeptide chain differs from protein to protein. 
D) the number of nucleotides found in each protein varies from molecule to molecule. 
A) the peptide bonds linking amino acids differ from protein to protein. 
B) each protein contains its own unique sequence of sugar molecules. 
C) the sequence of amino acids in the polypeptide chain differs from protein to protein. 
D) the number of nucleotides found in each protein varies from molecule to molecule.

Question 7

DNA differs from RNA because DNA

Accepted Answer

A) contains thymine in place of uracil. 
B) contains the sugar ribose rather than the sugar deoxyribose. 
C) contains phosphate groups not found in RNA. 
D) consists of a single rather than a double polynucleotide strand. 
A) contains thymine in place of uracil. 
B) contains the sugar ribose rather than the sugar deoxyribose. 
C) contains phosphate groups not found in RNA. 
D) consists of a single rather than a double polynucleotide strand.

Question 8

Which of the following statements regarding triglyceride molecules is false?

Accepted Answer

A) Triglycerides consist of three fatty acids attached to a glycerol. 
B) Triglycerides are a type of fat. 
C) Triglycerides play a role in energy storage. 
D) Triglycerides are hydrophilic. 
A) Triglycerides consist of three fatty acids attached to a glycerol. 
B) Triglycerides are a type of fat. 
C) Triglycerides play a role in energy storage. 
D) Triglycerides are hydrophilic.

Question 9

How are these two amino acids attached together?

Accepted Answer

A) through a hydrolysis reaction 
B) amino group to carboxylic acid group 
C) carboxylic acid group to carboxylic acid group 
D) amino group to amino group 
A) through a hydrolysis reaction 
B) amino group to carboxylic acid group 
C) carboxylic acid group to carboxylic acid group 
D) amino group to amino group

Question 10

Which of the following is an example of secondary structure in a protein?

Accepted Answer

A) a globular shape 
B) an alpha helix 
C) the joining of two polypeptide chains 
D) a particular amino acid sequence 
A) a globular shape 
B) an alpha helix 
C) the joining of two polypeptide chains 
D) a particular amino acid sequence

Question 11

The tertiary structure of a polypeptide refers to

Accepted Answer

A) the amino acids of which it is made. 
B) its size. 
C) the overall three- dimensional structure. 
D) the presence of pleated sheets. 
A) the amino acids of which it is made. 
B) its size. 
C) the overall three- dimensional structure. 
D) the presence of pleated sheets.

Question 12

Which of the following statements about dehydration synthesis is false?

Accepted Answer

A) Animal digestive systems utilize this process to break down food. 
B) H2O is formed as the monomers are joined. 
C) One monomer loses a hydrogen atom,and the other loses a hydroxyl group. 
D) Covalent bonds are formed between the monomers. 
A) Animal digestive systems utilize this process to break down food. 
B) H2O is formed as the monomers are joined. 
C) One monomer loses a hydrogen atom,and the other loses a hydroxyl group. 
D) Covalent bonds are formed between the monomers.

Question 13

Which of the following lists contains only polysaccharides?

Accepted Answer

A) starch,amino acids,and glycogen 
B) sucrose,starch,and cellulose 
C) cellulose,starch,and glycogen 
D) fructose,cellulose,and glucose 
A) starch,amino acids,and glycogen 
B) sucrose,starch,and cellulose 
C) cellulose,starch,and glycogen 
D) fructose,cellulose,and glucose

Question 14

Organic compounds

Accepted Answer

A) always contain carbon. 
B) always contain oxygen. 
C) always contain nitrogen. 
D) are synthesized only by animal cells. 
A) always contain carbon. 
B) always contain oxygen. 
C) always contain nitrogen. 
D) are synthesized only by animal cells.

Question 15

The molecular formula of most monosaccharides represents a multiple of

Accepted Answer

A) CHO. 
B) CH2O. 
C) CH3O. 
D) CHO2. 
A) CHO. 
B) CH2O. 
C) CH3O. 
D) CHO2.

Question 16

Lactose intolerance

Accepted Answer

A) is common in people of all ages,from infancy to adulthood. 
B) is most common in people of European descent. 
C) does not affect the consumption of beverages made from soy or rice. 
D) can currently be treated by gene therapy to treat the underlying cause. 
A) is common in people of all ages,from infancy to adulthood. 
B) is most common in people of European descent. 
C) does not affect the consumption of beverages made from soy or rice. 
D) can currently be treated by gene therapy to treat the underlying cause.

Question 17

Fatty acids with double bonds between some of their carbons are said to be

Accepted Answer

A) unsaturated. 
B) monoglycerides. 
C) completely hydrogenated. 
D) saturated. 
A) unsaturated. 
B) monoglycerides. 
C) completely hydrogenated. 
D) saturated.

Question 18

Which of the following statements about the functional groups of organic compounds is false?

Accepted Answer

A) Functional groups help make organic compounds hydrophilic. 
B) Functional groups participate in chemical reactions. 
C) All functional groups include a carbon atom. 
D) Many biological molecules have two or more functional groups. 
A) Functional groups help make organic compounds hydrophilic. 
B) Functional groups participate in chemical reactions. 
C) All functional groups include a carbon atom. 
D) Many biological molecules have two or more functional groups.

Question 19

You work for a company that manufactures food products.A new "wonder food" is being distributed by a rival company.The researchers in your company determine that the "wonder food" contains only carbon,oxygen,and hydrogen.At this point,your researchers can say with certainty that the food

Accepted Answer

A) could only be made of triglycerides. 
B) does not include proteins or nucleic acids. 
C) could only be made of carbohydrates. 
D) includes proteins. 
A) could only be made of triglycerides. 
B) does not include proteins or nucleic acids. 
C) could only be made of carbohydrates. 
D) includes proteins.

Question 20

A major type of lipid found in cell membranes is

Accepted Answer

A) phospholipids. 
B) triglycerides. 
C) glycerol. 
D) waxes. 
A) phospholipids. 
B) triglycerides. 
C) glycerol. 
D) waxes.

Exam 3: The Molecules of Cells

Structural proteins

Which of the following statements regarding nucleotides is false?

A scientist suspects that the food in an ecosystem may have been contaminated with radioactive nitrogen over a period of months.Which of the following substances could be examined for radioactivity to test the hypothesis?

What is the general function of enzymes within a cell?

The primary structure of a protein is

Proteins differ from one another because

DNA differs from RNA because DNA

Which of the following statements regarding triglyceride molecules is false?

How are these two amino acids attached together?

Which of the following is an example of secondary structure in a protein?

The tertiary structure of a polypeptide refers to

Which of the following statements about dehydration synthesis is false?

Which of the following lists contains only polysaccharides?

Organic compounds

The molecular formula of most monosaccharides represents a multiple of

Lactose intolerance

Fatty acids with double bonds between some of their carbons are said to be

Which of the following statements about the functional groups of organic compounds is false?

You work for a company that manufactures food products.A new "wonder food" is being distributed by a rival company.The researchers in your company determine that the "wonder food" contains only carbon,oxygen,and hydrogen.At this point,your researchers can say with certainty that the food

A major type of lipid found in cell membranes is

Biology: Exploring Life

The Chemical Basis of Life

A Tour of the Cell

The Working Cell

How Cells Harvest Chemical Energy

Photosynthesis: Using Light to Make Food

The Cellular Basis of Reproduction and Inheritance

Patterns of Inheritance

Molecular Biology of the Gene

How Genes Are Controlled

Dna Technology and Genomics

How Populations Evolve

The Origin of Species

Tracing Evolutionary History

Microbial Life: Prokaryotes and Protists

The Evolution of Plant and Fungal Diversity

The Evolution of Invertebrate Diversity

The Evolution of Vertebrate Diversity

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Gas Exchange

Circulation

The Immune System

Control of Body Temperature and Water Balance

Hormones and the Endocrine System

Reproduction and Embryonic Development

Nervous Systems

The Senses

How Animals Move

Plant Structure,growth,and Reproduction

Plant Nutrition and Transport

Control Systems in Plants

The Biosphere: an Introduction to Earths Diverse Environments

Behavioral Adaptations to the Environment

Population Ecology

Communities and Ecosystems

Conservation Biology

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