Question 1

The detection of nucleotides as they pass through an automated DNA sequencing machine is made by

Accepted Answer

A)  radioactivity. 
B)  fluorescence. 
C)  antibiotic resistance. 
D)  electron microscopy. 
E)  gel electrophoresis. 
A)  radioactivity. 
B)  fluorescence. 
C)  antibiotic resistance. 
D)  electron microscopy. 
E)  gel electrophoresis.

Question 2

Scientists have been able to clone

Accepted Answer

A)  sheep. 
B)  cats. 
C)  rabbits. 
D)  pigs. 
E)  all of these. 
A)  sheep. 
B)  cats. 
C)  rabbits. 
D)  pigs. 
E)  all of these.

Question 3

Which substance is found in RNA but not in DNA?

Accepted Answer

A)  thymine 
B)  deoxyribose 
C)  ribose 
D)  guanine 
E)  cytosine 
A)  thymine 
B)  deoxyribose 
C)  ribose 
D)  guanine 
E)  cytosine

Question 4

The DNA molecule could be compared to a

Accepted Answer

A)  hairpin. 
B)  ladder. 
C)  key. 
D)  globular mass. 
E)  flat plate. 
A)  hairpin. 
B)  ladder. 
C)  key. 
D)  globular mass. 
E)  flat plate.

Question 5

The ultimate explanation for resemblances of traits from one generation to another is

Accepted Answer

A)  gamete formation. 
B)  semiconservative DNA replication. 
C)  sexual reproduction. 
D)  protein synthesis. 
E)  bloodlines. 
A)  gamete formation. 
B)  semiconservative DNA replication. 
C)  sexual reproduction. 
D)  protein synthesis. 
E)  bloodlines.

Question 6

Transcription starts at a region of DNA called a(n)

Accepted Answer

A)  sequencer. 
B)  promoter. 
C)  activator. 
D)  terminator. 
E)  transcriber. 
A)  sequencer. 
B)  promoter. 
C)  activator. 
D)  terminator. 
E)  transcriber.

Question 7

a(n. ____ is a manmade, short nucleotide sequence that base-pairs with any complementary sequences in DNA.

Accepted Answer

A)  primer 
B)  exon 
C)  intron 
D)  restriction enzyme 
E)  polysome 
A)  primer 
B)  exon 
C)  intron 
D)  restriction enzyme 
E)  polysome

Question 8

In DNA, complementary base pairing occurs between

Accepted Answer

A)  cytosine and uracil. 
B)  adenine and guanine. 
C)  adenine and uracil. 
D)  adenine and thymine 
E)  uracil and guanine. 
A)  cytosine and uracil. 
B)  adenine and guanine. 
C)  adenine and uracil. 
D)  adenine and thymine 
E)  uracil and guanine.

Question 9

The difference between normal hemoglobin and sickle-cell hemoglobin is in the

Accepted Answer

A)  heme portion of the molecules. 
B)  number of chains of amino acids. 
C)  substitution of a specific amino acid for another specific amino acid. 
D)  addition of one amino acid to the normal hemoglobin molecule. 
E)  deletion of only one amino acid from the normal hemoglobin molecule. 
A)  heme portion of the molecules. 
B)  number of chains of amino acids. 
C)  substitution of a specific amino acid for another specific amino acid. 
D)  addition of one amino acid to the normal hemoglobin molecule. 
E)  deletion of only one amino acid from the normal hemoglobin molecule.

Question 10

Genes may be

Accepted Answer

A)  turned on and off. 
B)  never turned on. 
C)  turned on and left on. 
D)  activated for only a short time in one cell and a long time in another cell. 
E)  all of these 
A)  turned on and off. 
B)  never turned on. 
C)  turned on and left on. 
D)  activated for only a short time in one cell and a long time in another cell. 
E)  all of these

Question 11

If each nucleotide coded for a single amino acid, how many different types of amino acids could be combined to form proteins?

Accepted Answer

A)  4 
B)  16 
C)  20 
D)  64 
E)  0 
A)  4 
B)  16 
C)  20 
D)  64 
E)  0

Question 12

The relationship between strands of RNA and DNA is

Accepted Answer

A)  antagonistic. 
B)  opposite. 
C)  complementary. 
D)  an exact duplicate. 
E)  unrelated. 
A)  antagonistic. 
B)  opposite. 
C)  complementary. 
D)  an exact duplicate. 
E)  unrelated.

Question 13

Selecting the Exception Four of the five enzymes listed below are used in genetic engineering. Select the exception.

Accepted Answer

A)  ligase 
B)  reverse transcriptase 
C)  restriction 
D)  replicase 
E)  DNA polymerase 
A)  ligase 
B)  reverse transcriptase 
C)  restriction 
D)  replicase 
E)  DNA polymerase

Question 14

Restriction enzymes

Accepted Answer

A)  often produce staggered cuts in DNA that are useful in splicing genes. 
B)  are like most enzymes in that they are very specific in their action. 
C)  are natural defense mechanisms evolved in bacteria to cut apart short sequences of DNA. 
D)  are used along with ligase and plasmids to achieve genetic recombination. 
E)  all of these 
A)  often produce staggered cuts in DNA that are useful in splicing genes. 
B)  are like most enzymes in that they are very specific in their action. 
C)  are natural defense mechanisms evolved in bacteria to cut apart short sequences of DNA. 
D)  are used along with ligase and plasmids to achieve genetic recombination. 
E)  all of these

Question 15

If the DNA triplets were ATG - CGT, the tRNA anticodons would be

Accepted Answer

A)  AUG - CGU. 
B)  ATG - CGT. 
C)  UAC - GCA. 
D)  UAG - CGU. 
E)  CGT-ATG. 
A)  AUG - CGU. 
B)  ATG - CGT. 
C)  UAC - GCA. 
D)  UAG - CGU. 
E)  CGT-ATG.

Question 16

When step "d" is completed, the two DNA molecules produced will be

Accepted Answer

A)  identical to each other but not to the parent DNA. 
B)  identical to the parent DNA but not to each other. 
C)  different from each other and the parent DNA. 
D)  identical to each other and to the parent DNA. 
E)  identical to each other and almost the same as the parent DNA. 
A)  identical to each other but not to the parent DNA. 
B)  identical to the parent DNA but not to each other. 
C)  different from each other and the parent DNA. 
D)  identical to each other and to the parent DNA. 
E)  identical to each other and almost the same as the parent DNA.

Question 17

Enzymes used to cut DNA molecules in recombinant DNA research are

Accepted Answer

A)  ligases. 
B)  restriction enzymes. 
C)  transcriptases. 
D)  DNA polymerases. 
E)  replicases. 
A)  ligases. 
B)  restriction enzymes. 
C)  transcriptases. 
D)  DNA polymerases. 
E)  replicases.

Question 18

The portion of the DNA molecule that is ultimately translated is composed of

Accepted Answer

A)  introns. 
B)  anticodons. 
C)  exons. 
D)  transcriptions. 
E)  regulatory proteins. 
A)  introns. 
B)  anticodons. 
C)  exons. 
D)  transcriptions. 
E)  regulatory proteins.

Question 19

Plasmids

Accepted Answer

A)  are circular molecules of DNA. 
B)  are sites for inserting genes for amplification. 
C)  may be copied by bacterial replication enzymes. 
D)  will become larger when foreign DNA is inserted. 
E)  all of these 
A)  are circular molecules of DNA. 
B)  are sites for inserting genes for amplification. 
C)  may be copied by bacterial replication enzymes. 
D)  will become larger when foreign DNA is inserted. 
E)  all of these

Question 20

Each DNA strand serves as which of the following during DNA synthesis?

Accepted Answer

A)  replicate 
B)  substitute 
C)  template 
D)  source of nucleotides 
E)  source of sugars 
A)  replicate 
B)  substitute 
C)  template 
D)  source of nucleotides 
E)  source of sugars

Exam 21: DNA, Genes, and Biotechnology

The detection of nucleotides as they pass through an automated DNA sequencing machine is made by

Scientists have been able to clone

Which substance is found in RNA but not in DNA?

The DNA molecule could be compared to a

The ultimate explanation for resemblances of traits from one generation to another is

Transcription starts at a region of DNA called a(n)

a(n. ____ is a manmade, short nucleotide sequence that base-pairs with any complementary sequences in DNA.

In DNA, complementary base pairing occurs between

The difference between normal hemoglobin and sickle-cell hemoglobin is in the

Genes may be

If each nucleotide coded for a single amino acid, how many different types of amino acids could be combined to form proteins?

The relationship between strands of RNA and DNA is

Selecting the Exception Four of the five enzymes listed below are used in genetic engineering. Select the exception.

Restriction enzymes

If the DNA triplets were ATG - CGT, the tRNA anticodons would be

When step "d" is completed, the two DNA molecules produced will be

Enzymes used to cut DNA molecules in recombinant DNA research are

The portion of the DNA molecule that is ultimately translated is composed of

Plasmids

Each DNA strand serves as which of the following during DNA synthesis?

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Cells and How They Work

Tissues, Organs, and Organ Systems

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Introduction to Genetics

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