Question 1

In modern biochemical genetics,the flow of inherited information is from

Accepted Answer

A) protein $\rightarrow$ RNA$\rightarrow$DNA. 
B) DNA$\rightarrow$RNA$\rightarrow$ protein. 
C) DNA $\rightarrow$ protein$\rightarrow$ RNA. 
D) RNA $\rightarrow$DNA$\rightarrow$protein. 
E) RNA $\rightarrow$ protein $\rightarrow$ DNA. 
A) protein $\rightarrow$ RNA$\rightarrow$DNA. 
B) DNA$\rightarrow$RNA$\rightarrow$ protein. 
C) DNA $\rightarrow$ protein$\rightarrow$ RNA. 
D) RNA $\rightarrow$DNA$\rightarrow$protein. 
E) RNA $\rightarrow$ protein $\rightarrow$ DNA.

Question 2

Which level of primary control in eukaryotic gene activity involves changes in the polypeptide chain before it becomes functional?

Accepted Answer

A) feedback control 
B) translational control 
C) transcriptional control 
D) posttranscriptional control 
E) posttranslational control 
A) feedback control 
B) translational control 
C) transcriptional control 
D) posttranscriptional control 
E) posttranslational control

Question 3

In the Watson-Crick model of DNA,the "sides" of the ladder are composed of

Accepted Answer

A) sugars. 
B) bases. 
C) hydrogen bonds. 
D) sugar-phosphate molecules. 
E) phosphate groups. 
A) sugars. 
B) bases. 
C) hydrogen bonds. 
D) sugar-phosphate molecules. 
E) phosphate groups.

Question 4

Which is NOT true about the genetic code?

Accepted Answer

A) It is exactly the same in all organisms. 
B) It is composed of a triplet code of three bases per codon. 
C) It produces 64 different possibilities of codon sequences. 
D) Some amino acids are coded for by more than one codon. 
E) It contains start and stop codons as instructions. 
A) It is exactly the same in all organisms. 
B) It is composed of a triplet code of three bases per codon. 
C) It produces 64 different possibilities of codon sequences. 
D) Some amino acids are coded for by more than one codon. 
E) It contains start and stop codons as instructions.

Question 5

Which of the following is NOT true of ribosomes?

Accepted Answer

A) They are produced in the nucleus of a eukaryotic cell. 
B) They are made of RNA and proteins. 
C) They are composed of two subunits that only come together when protein synthesis is about to occur. 
D) They bind only one type of amino acid. 
E) DNA serves as a template for rRNA. 
A) They are produced in the nucleus of a eukaryotic cell. 
B) They are made of RNA and proteins. 
C) They are composed of two subunits that only come together when protein synthesis is about to occur. 
D) They bind only one type of amino acid. 
E) DNA serves as a template for rRNA.

Question 6

Which of the following behaviors will NOT help prevent cancer?

Accepted Answer

A) avoid carcinogenic chemicals 
B) avoid excessive sunlight 
C) lower total fat intake 
D) decrease intake of high-fiber foods 
E) increase consumption of broccoli 
A) avoid carcinogenic chemicals 
B) avoid excessive sunlight 
C) lower total fat intake 
D) decrease intake of high-fiber foods 
E) increase consumption of broccoli

Question 7

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence

Accepted Answer

A) indicating that DNA has a double helix structure. 
B) showing the bases of DNA were held together by hydrogen bonds. 
C) showing equal numbers of purines and pyrimidines. 
D) revealing the structure of the deoxyribose sugar. 
E) of the location of each adenine,guanine,cytosine,and thymine. 
A) indicating that DNA has a double helix structure. 
B) showing the bases of DNA were held together by hydrogen bonds. 
C) showing equal numbers of purines and pyrimidines. 
D) revealing the structure of the deoxyribose sugar. 
E) of the location of each adenine,guanine,cytosine,and thymine.

Question 8

Which of the classes of RNA molecules carries the amino acids that are added to the growing polypeptide chain?

Accepted Answer

A) ribosomal RNA 
B) transfer RNA 
C) messenger RNA 
D) primary mRNA transcript 
E) ribozyme 
A) ribosomal RNA 
B) transfer RNA 
C) messenger RNA 
D) primary mRNA transcript 
E) ribozyme

Question 9

The hereditary material found in all cells is

Accepted Answer

A) DNA. 
B) rRNA. 
C) mRNA. 
D) tRNA. 
E) ATP. 
A) DNA. 
B) rRNA. 
C) mRNA. 
D) tRNA. 
E) ATP.

Question 10

Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.Which of the following would NOT be an essential part of this experiment?

Accepted Answer

A) Sulfur is present in amino acids in the protein coat of bacteria. 
B) Phosphorus is present in high amounts in DNA. 
C) Sulfur is not present in DNA. 
D) Phosphorus is not present in amino acids in the protein coat of bacteria. 
E) DNA contains nitrogen. 
A) Sulfur is present in amino acids in the protein coat of bacteria. 
B) Phosphorus is present in high amounts in DNA. 
C) Sulfur is not present in DNA. 
D) Phosphorus is not present in amino acids in the protein coat of bacteria. 
E) DNA contains nitrogen.

Question 11

During the process of transcription,the information in

Accepted Answer

A) a protein is converted into RNA information. 
B) RNA is converted into protein information. 
C) RNA is converted into DNA information. 
D) DNA is converted into RNA information. 
E) DNA is converted into protein information. 
A) a protein is converted into RNA information. 
B) RNA is converted into protein information. 
C) RNA is converted into DNA information. 
D) DNA is converted into RNA information. 
E) DNA is converted into protein information.

Question 12

Messenger RNA is produced in the

Accepted Answer

A) cytoplasm. 
B) ribosomes. 
C) nucleus. 
D) endoplasmic reticulum. 
E) lysosome. 
A) cytoplasm. 
B) ribosomes. 
C) nucleus. 
D) endoplasmic reticulum. 
E) lysosome.

Question 13

Which factor is likely to lead to a change in the genetic control of the individual and possibly cancer?

Accepted Answer

A) X-rays 
B) ultraviolet radiation 
C) cigarette smoke 
D) pesticides 
E) All of the answer choices can lead to cancer. 
A) X-rays 
B) ultraviolet radiation 
C) cigarette smoke 
D) pesticides 
E) All of the answer choices can lead to cancer.

Question 14

Eukaryotic transcription factors assist the ______ in binding to the _________.

Accepted Answer

A) repressor; operator 
B) RNA polymerase; promoter 
C) DNA polymerase; promoter 
D) helicases; operator 
E) operator; repressor 
A) repressor; operator 
B) RNA polymerase; promoter 
C) DNA polymerase; promoter 
D) helicases; operator 
E) operator; repressor

Question 15

Information from X-ray crystallographic data collected by _______ was used by Watson and Crick in their development of the model of DNA.

Accepted Answer

A) Chargaff 
B) Griffith 
C) McClintock 
D) Franklin 
E) Hershey and Chase 
A) Chargaff 
B) Griffith 
C) McClintock 
D) Franklin 
E) Hershey and Chase

Question 16

____________ regulation occurs within a cell when the newly formed protein is modified.

Accepted Answer

A) Transcriptional 
B) Posttranscriptional 
C) Translational 
D) Posttranslational 
E) Operon 
A) Transcriptional 
B) Posttranscriptional 
C) Translational 
D) Posttranslational 
E) Operon

Question 17

Which level of primary control in eukaryotic gene activity involves the life span of the mRNA molecule and the ability of the mRNA to bind to ribosomes?

Accepted Answer

A) feedback control 
B) translational control 
C) transcriptional control 
D) posttranscriptional control 
E) posttranslational control 
A) feedback control 
B) translational control 
C) transcriptional control 
D) posttranscriptional control 
E) posttranslational control

Question 18

Tumor suppressor genes are

Accepted Answer

A) oncogenes that code for proteins that inhibit cell division. 
B) anti-oncogenes that code for proteins that inhibit cell division. 
C) oncogenes that code for proteins that stimulate cell division. 
D) anti-oncogenes that code for proteins that stimulate cell division. 
E) transposons that can be used as cancer therapy. 
A) oncogenes that code for proteins that inhibit cell division. 
B) anti-oncogenes that code for proteins that inhibit cell division. 
C) oncogenes that code for proteins that stimulate cell division. 
D) anti-oncogenes that code for proteins that stimulate cell division. 
E) transposons that can be used as cancer therapy.

Question 19

Which part of an operon is incorrectly matched with its function?

Accepted Answer

A) promoter-where RNA polymerase first binds to DNA 
B) regulator-binds to the repressor protein 
C) structural-makes mRNA by transcription 
D) operator-if unbound,allows RNA polymerase to bind to DNA 
E) All of the answer choices are incorrectly matched with its function. 
A) promoter-where RNA polymerase first binds to DNA 
B) regulator-binds to the repressor protein 
C) structural-makes mRNA by transcription 
D) operator-if unbound,allows RNA polymerase to bind to DNA 
E) All of the answer choices are incorrectly matched with its function.

Question 20

In eukaryotes,control of gene expression is NOT by

Accepted Answer

A) translational control in cytoplasm after mRNA leaves the nucleus and before protein is produced. 
B) transcriptional control in the nucleus based on which genes are transcribed and how fast they are transcribed. 
C) posttranscriptional control in the nucleus after DNA is transcribed,including the speed with which mRNA leaves the nucleus. 
D) posttranslational control in the cytoplasm that occurs after protein synthesis. 
E) the use of repressor proteins and operators. 
A) translational control in cytoplasm after mRNA leaves the nucleus and before protein is produced. 
B) transcriptional control in the nucleus based on which genes are transcribed and how fast they are transcribed. 
C) posttranscriptional control in the nucleus after DNA is transcribed,including the speed with which mRNA leaves the nucleus. 
D) posttranslational control in the cytoplasm that occurs after protein synthesis. 
E) the use of repressor proteins and operators.

Exam 25: Dna Structure and Control of Gene Expression

In modern biochemical genetics,the flow of inherited information is from

Which level of primary control in eukaryotic gene activity involves changes in the polypeptide chain before it becomes functional?

In the Watson-Crick model of DNA,the "sides" of the ladder are composed of

Which is NOT true about the genetic code?

Which of the following is NOT true of ribosomes?

Which of the following behaviors will NOT help prevent cancer?

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence

Which of the classes of RNA molecules carries the amino acids that are added to the growing polypeptide chain?

The hereditary material found in all cells is

Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.Which of the following would NOT be an essential part of this experiment?

During the process of transcription,the information in

Messenger RNA is produced in the

Which factor is likely to lead to a change in the genetic control of the individual and possibly cancer?

Eukaryotic transcription factors assist the ______ in binding to the _________.

Information from X-ray crystallographic data collected by _______ was used by Watson and Crick in their development of the model of DNA.

____________ regulation occurs within a cell when the newly formed protein is modified.

Which level of primary control in eukaryotic gene activity involves the life span of the mRNA molecule and the ability of the mRNA to bind to ribosomes?

Tumor suppressor genes are

Which part of an operon is incorrectly matched with its function?

In eukaryotes,control of gene expression is NOT by

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