Question 1

The idea that the adenine and thymine bases of the DNA interact in some manner was first proposed by ________.

Accepted Answer

A)  Watson and Crick 
B)  Franklin 
C)  Pauling 
D)  Chargaff 
A)  Watson and Crick 
B)  Franklin 
C)  Pauling 
D)  Chargaff

Question 2

DNA differs from RNA in which way?

Accepted Answer

A)  the structure of the nucleotide 
B)  the five-carbon sugar it uses 
C)  the size of the phosphate groups 
D)  the number of bases attached to the sugar 
A)  the structure of the nucleotide 
B)  the five-carbon sugar it uses 
C)  the size of the phosphate groups 
D)  the number of bases attached to the sugar

Question 3

The term nucleic acids is used to describe RNA and DNA because

Accepted Answer

A)  they are acidic molecules and have a net negative charge at neutral pH. 
B)  they are acidic molecules and have a net positive charge at neutral pH. 
C)  they are acidic molecules and have no charge at neutral pH. 
A)  they are acidic molecules and have a net negative charge at neutral pH. 
B)  they are acidic molecules and have a net positive charge at neutral pH. 
C)  they are acidic molecules and have no charge at neutral pH.

Question 4

In a double-helix DNA strand,the adenine on one strand forms a hydrogen bond with a(n)________ on the other strand.

Accepted Answer

A)  adenine 
B)  guanine 
C)  thymine 
D)  cytosine 
A)  adenine 
B)  guanine 
C)  thymine 
D)  cytosine

Question 5

These individuals determined that DNA was the genetic material in T2 phage.

Accepted Answer

A)  Hershey and Chase 
B)  Avery, Macleod, and McCarty 
C)  Watson and Crick 
D)  Creighton and McClintock 
A)  Hershey and Chase 
B)  Avery, Macleod, and McCarty 
C)  Watson and Crick 
D)  Creighton and McClintock

Question 6

A nucleoside consists of only a five-carbon sugar and a phosphate group.

Accepted Answer

A) True 
 B)False

Question 7

The building blocks of DNA are called ________.

Accepted Answer

A)  amino acids 
B)  codons 
C)  nucleotides 
D)  alleles 
A)  amino acids 
B)  codons 
C)  nucleotides 
D)  alleles

Question 8

According to Chargaff's rule,if the DNA of a species contains 20% adenine,what percent of guanine will it contain?

Accepted Answer

A)  20% 
B)  30% 
C)  50% 
D)  75% 
A)  20% 
B)  30% 
C)  50% 
D)  75%

Question 9

The purine bases are ________.

Accepted Answer

A)  cytosine, thymine, and uracil 
B)  adenine and guanine 
C)  adenine and thymine 
D)  cytosine and guanine 
A)  cytosine, thymine, and uracil 
B)  adenine and guanine 
C)  adenine and thymine 
D)  cytosine and guanine

Question 10

How is the directionality of a DNA molecule described based on the orientation of sugar molecules within the strand?

Accepted Answer

A)  left to right 
B)  top to bottom 
C)  5′ to 3′ 
D)  A to T or G to C 
E)  All DNA molecules are different in their directionality. 
A)  left to right 
B)  top to bottom 
C)  5′ to 3′ 
D)  A to T or G to C 
E)  All DNA molecules are different in their directionality.

Question 11

Select the ways in which an RNA strand differs from a DNA strand.

Accepted Answer

A)  It contains ribose instead of deoxyribose. 
B)  It is usually single-stranded. 
C)  It contains uracil instead of thymine. 
D)  It runs 6′ to 3′ instead of 5′ to 3′. 
A)  It contains ribose instead of deoxyribose. 
B)  It is usually single-stranded. 
C)  It contains uracil instead of thymine. 
D)  It runs 6′ to 3′ instead of 5′ to 3′.

Question 12

Select the statements that are true about T2 phage.

Accepted Answer

A)  It requires a host cell for replication. 
B)  It attaches to the cell wall of a target bacterium. 
C)  It injects the protein coat into the host cell. 
D)  New phages are made inside the host cell. 
E)  New phages are released by the process of lysis. 
A)  It requires a host cell for replication. 
B)  It attaches to the cell wall of a target bacterium. 
C)  It injects the protein coat into the host cell. 
D)  New phages are made inside the host cell. 
E)  New phages are released by the process of lysis.

Question 13

How many bases are necessary to complete one complete twist (360 degrees)of a DNA double helix?

Accepted Answer

A)  5 
B)  10 
C)  100 
D)  1000 
A)  5 
B)  10 
C)  100 
D)  1000

Question 14

Frederick Griffith is responsible for discovering what process?

Accepted Answer

A)  replication 
B)  transmission 
C)  transformation 
D)  transduction 
A)  replication 
B)  transmission 
C)  transformation 
D)  transduction

Question 15

In the Hershey-Chase experiments,the protein coat of the bacteriophage was labeled with the ³²P radioisotope.

Accepted Answer

A) True 
 B)False

Question 16

Adenine and thymine form ________ hydrogen bonds between them,while cytosine and guanine form ________ bonds.

Accepted Answer

A)  2; 3 
B)  3; 4 
C)  3; 2 
D)  4; 3 
A)  2; 3 
B)  3; 4 
C)  3; 2 
D)  4; 3

Question 17

One strand of DNA is 5′ - AGGCCTTA - 3′.What is the opposite strand?

Accepted Answer

A)  5′ - AGGCCTTA - 3′ 
B)  5′ - TCCGGAAT - 3′ 
C)  3′ - AGGCCTTA - 5′ 
D)  3′ - TCCGGAAT - 5′ 
A)  5′ - AGGCCTTA - 3′ 
B)  5′ - TCCGGAAT - 3′ 
C)  3′ - AGGCCTTA - 5′ 
D)  3′ - TCCGGAAT - 5′

Question 18

The pyrimidine bases are ________.

Accepted Answer

A)  cytosine, thymine, and uracil 
B)  adenine and guanine 
C)  adenine and thymine 
D)  cytosine and guanine 
A)  cytosine, thymine, and uracil 
B)  adenine and guanine 
C)  adenine and thymine 
D)  cytosine and guanine

Exam 11: Molecular Structure of DNA and RNA

The idea that the adenine and thymine bases of the DNA interact in some manner was first proposed by ________.

DNA differs from RNA in which way?

The term nucleic acids is used to describe RNA and DNA because

In a double-helix DNA strand,the adenine on one strand forms a hydrogen bond with a(n)________ on the other strand.

These individuals determined that DNA was the genetic material in T2 phage.

A nucleoside consists of only a five-carbon sugar and a phosphate group.

The building blocks of DNA are called ________.

According to Chargaff's rule,if the DNA of a species contains 20% adenine,what percent of guanine will it contain?

The purine bases are ________.

How is the directionality of a DNA molecule described based on the orientation of sugar molecules within the strand?

Select the ways in which an RNA strand differs from a DNA strand.

Select the statements that are true about T2 phage.

How many bases are necessary to complete one complete twist (360 degrees)of a DNA double helix?

Frederick Griffith is responsible for discovering what process?

In the Hershey-Chase experiments,the protein coat of the bacteriophage was labeled with the ³²P radioisotope.

Adenine and thymine form ________ hydrogen bonds between them,while cytosine and guanine form ________ bonds.

One strand of DNA is 5′ - AGGCCTTA - 3′.What is the opposite strand?

The pyrimidine bases are ________.

Overview of Genetics

Reproduction and Chromosome Transmission

Mendelian Inheritance

Sex Determination and Sex Chromosomes

Extensions of Mendelian Inheritance

Extranuclear Inheritance, Imprinting, and Maternal Effect

Genetic Linkage and Mapping in Eukaryotes

Variation in Chromosome Structure and Number

Genetics in Bacteria

Genetics of Viruses

Molecular Structure of Chromosomes and Transposition

Dna Replication and Recombination

Gene Transcription and RNA Modification

Translation of MRNA

Gene Regulation in Bacteria

Gene Regulation in Eukaryotes

Non-Coding Rnas

Gene Mutation and DNA Repair

Molecular Technologies

Genomics

Medical Genetics and Cancer

Population Genetics

Quantitative Genetics

Filters

Adenine and thymine form hydrogen bonds between them,while cytosine and guanine form bonds.