Question 1

Which of the following levels of control involves the use of a poly-A tail?

Accepted Answer

A) protein activity 
B) translation of mRNA 
C) mRNA processing 
D) transcriptional control 
E) chromatin structure 
A) protein activity 
B) translation of mRNA 
C) mRNA processing 
D) transcriptional control 
E) chromatin structure

Question 2

____________ bind to enhancers in eukaryotic cells to increase the rate of transcription.

Accepted Answer

A) Repressors 
B) RNA polymerases 
C) Ligases 
D) Transcription activators 
E) DNA polymerases 
A) Repressors 
B) RNA polymerases 
C) Ligases 
D) Transcription activators 
E) DNA polymerases

Question 3

Active genes are found in the _______ of eukaryotic chromosomes.

Accepted Answer

A) heterochromatin 
B) euchromatin 
C) Barr bodies 
D) promoters 
E) operons 
A) heterochromatin 
B) euchromatin 
C) Barr bodies 
D) promoters 
E) operons

Question 4

Which level of primary control in eukaryotic gene activity involves processing early RNA transcripts to mRNA and control of the rate at which mRNA leaves the nucleus?

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 5

Which of the following processes does NOT take place during translation?

Accepted Answer

A) attachment of a ribosome to mRNA 
B) growth of a polypeptide chain 
C) binding of two tRNA molecules/ribosome 
D) liberation of polypeptide from ribosome 
E) production of mRNA 
A) attachment of a ribosome to mRNA 
B) growth of a polypeptide chain 
C) binding of two tRNA molecules/ribosome 
D) liberation of polypeptide from ribosome 
E) production of mRNA

Question 6

Which of the following is NOT true about cancer cells?

Accepted Answer

A) They exhibit uncontrolled growth. 
B) They can form benign or malignant tumors. 
C) They exhibit disorganized growth. 
D) They exhibit contact inhibition. 
E) They may undergo metastasis. 
A) They exhibit uncontrolled growth. 
B) They can form benign or malignant tumors. 
C) They exhibit disorganized growth. 
D) They exhibit contact inhibition. 
E) They may undergo metastasis.

Question 7

DNA segments called _____ are at the ends of chromosomes and as they shorten they eventually signal the cell to enter apoptosis.

Accepted Answer

A) transposons 
B) mutagens 
C) activated chromatin 
D) operons 
E) telomeres 
A) transposons 
B) mutagens 
C) activated chromatin 
D) operons 
E) telomeres

Question 8

Which of the following is NOT a frameshift mutation of the nucleotide sequence CATUAUCCC?

Accepted Answer

A) CATTUAUCCC 
B) ATUAUCCC 
C) CTUAUCCC 
D) CATUAUCGC 
E) CCATUAUCCC 
A) CATTUAUCCC 
B) ATUAUCCC 
C) CTUAUCCC 
D) CATUAUCGC 
E) CCATUAUCCC

Question 9

The fact that for a given species the amount of purines in the DNA always matches the number of pyrimidines was first determined by

Accepted Answer

A) Watson and Crick. 
B) Franklin and Wilkins. 
C) Hershey and Chase. 
D) Chargaff. 
E) Mendel. 
A) Watson and Crick. 
B) Franklin and Wilkins. 
C) Hershey and Chase. 
D) Chargaff. 
E) Mendel.

Question 10

Indicate the complementary nucleotide sequence for the following section of DNA: AATGCGTATACG

Accepted Answer

DNA forms a complementary sequence,which

Question 11

Which of the following will NOT assist you in protecting yourself from cancer?

Accepted Answer

A) use of alcohol 
B) eating vitamin-rich foods 
C) reducing the amount of salt-cured and nitrate-cured foods 
D) reducing your weight 
E) regular exercise 
A) use of alcohol 
B) eating vitamin-rich foods 
C) reducing the amount of salt-cured and nitrate-cured foods 
D) reducing your weight 
E) regular exercise

Question 12

If the gene product needed is either transfer RNA or ribosomal RNA,the most efficient way to produce this product is

Accepted Answer

A) activating chromatin. 
B) increasing transcription factors. 
C) increasing the rate mRNA matures. 
D) increasing translational control. 
E) increasing posttranscriptional control. 
A) activating chromatin. 
B) increasing transcription factors. 
C) increasing the rate mRNA matures. 
D) increasing translational control. 
E) increasing posttranscriptional control.

Question 13

For translation to take place,which of the following would NOT be required to be present?

Accepted Answer

A) DNA 
B) mRNA 
C) tRNA amino acid complex 
D) rRNA 
E) ribosome 
A) DNA 
B) mRNA 
C) tRNA amino acid complex 
D) rRNA 
E) ribosome

Question 14

When the sheep Dolly was successfully cloned,it was produced by growing an in vitro fertilized egg where the normal egg nucleus had been removed and replaced by a nucleus from an adult.Since this nucleus is from an old mature animal,we would expect it to ______.Interestingly,tests show that this did not happen,a fact that currently puzzles researchers.

Accepted Answer

A) have additional Barr bodies 
B) be mutated 
C) have shorter telomeres 
D) have longer telomeres 
E) express transcription and translation more rapidly 
A) have additional Barr bodies 
B) be mutated 
C) have shorter telomeres 
D) have longer telomeres 
E) express transcription and translation more rapidly

Question 15

Which of the following is NOT part of gene expression?

Accepted Answer

A) transcription 
B) replication 
C) translation 
D) amino acids 
E) protein synthesis 
A) transcription 
B) replication 
C) translation 
D) amino acids 
E) protein synthesis

Question 16

The function of transfer RNA is to

Accepted Answer

A) carry amino acids to ribosomes. 
B) transfer nucleotides to the nucleus. 
C) transmit coded information to the cytoplasm. 
D) turn DNA on and off. 
E) act as the site for protein synthesis. 
A) carry amino acids to ribosomes. 
B) transfer nucleotides to the nucleus. 
C) transmit coded information to the cytoplasm. 
D) turn DNA on and off. 
E) act as the site for protein synthesis.

Question 17

Which is the process that synthesizes mRNA?

Accepted Answer

A) translation 
B) transcription 
C) transposition 
D) transformation 
E) translocation 
A) translation 
B) transcription 
C) transposition 
D) transformation 
E) translocation

Question 18

Segments of DNA that are NOT part of the gene are called

Accepted Answer

A) exons. 
B) introns. 
C) transposons. 
D) inducers. 
E) promoters. 
A) exons. 
B) introns. 
C) transposons. 
D) inducers. 
E) promoters.

Question 19

Which of the following is NOT true about oncogenes?

Accepted Answer

A) They are normal genes that have undergone a mutation. 
B) They cause growth factors or growth factor receptors on a cell to malfunction. 
C) When mutated,oncogenes turn into proto-oncogenes. 
D) They cause a cell to divide repeatedly. 
E) They are not alien to the cell. 
A) They are normal genes that have undergone a mutation. 
B) They cause growth factors or growth factor receptors on a cell to malfunction. 
C) When mutated,oncogenes turn into proto-oncogenes. 
D) They cause a cell to divide repeatedly. 
E) They are not alien to the cell.

Question 20

Prior to protein synthesis,the DNA

Accepted Answer

A) attracts tRNAs with appropriate amino acids. 
B) serves as a template for the production of mRNA. 
C) adheres to ribosomes for protein synthesis. 
D) contains anticodons that become codons. 
E) must first undergo replication. 
A) attracts tRNAs with appropriate amino acids. 
B) serves as a template for the production of mRNA. 
C) adheres to ribosomes for protein synthesis. 
D) contains anticodons that become codons. 
E) must first undergo replication.

Exam 25: Dna Structure and Control of Gene Expression

Which of the following levels of control involves the use of a poly-A tail?

____________ bind to enhancers in eukaryotic cells to increase the rate of transcription.

Active genes are found in the _______ of eukaryotic chromosomes.

Which level of primary control in eukaryotic gene activity involves processing early RNA transcripts to mRNA and control of the rate at which mRNA leaves the nucleus?

Which of the following processes does NOT take place during translation?

Which of the following is NOT true about cancer cells?

DNA segments called _____ are at the ends of chromosomes and as they shorten they eventually signal the cell to enter apoptosis.

Which of the following is NOT a frameshift mutation of the nucleotide sequence CATUAUCCC?

The fact that for a given species the amount of purines in the DNA always matches the number of pyrimidines was first determined by

Indicate the complementary nucleotide sequence for the following section of DNA: AATGCGTATACG

Which of the following will NOT assist you in protecting yourself from cancer?

If the gene product needed is either transfer RNA or ribosomal RNA,the most efficient way to produce this product is

For translation to take place,which of the following would NOT be required to be present?

Which of the following is NOT part of gene expression?

The function of transfer RNA is to

Which is the process that synthesizes mRNA?

Segments of DNA that are NOT part of the gene are called

Which of the following is NOT true about oncogenes?

Prior to protein synthesis,the DNA

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