Question 1

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)   ribosomeF) None of the above
G) B) and D)

Question 2

Which does NOT describe a function of the DNA polymerase molecule?

Accepted Answer

A)   recognize the free nucleotide that pairs with the base on the old strand of DNA
B)   read the strand of old DNA and recognize the base there
C)   proofread to ensure that the proper base has been incorporated
D)   make the proper nucleotide to match with the base read on the old strand
E)   nucleotides are joined by hydrogen bondsF) A) and E)
G) A) and D)

Question 3

Which is the process that synthesizes mRNA?

Accepted Answer

A)   translation
B)   transcription
C)   transposition
D)   transformation
E)   translocationF) B) and E)
G) A) and B)

Question 4

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.F) D) and E)
G) A) and E)

Question 5

Which of the following is NOT true about RNA?

Accepted Answer

A)   RNA transfers messages from DNA to ribosomes.
B)   RNA contains the sugar ribose.
C)   RNA contains adenine, guanine, uracil, and cytosine.
D)   RNA is single stranded.
E)   RNA forms a helix.F) All of the above
G) C) and E)

Question 6

An oncogene is

Accepted Answer

A)   a viral gene with no relation to the host cells genes.
B)   a mutated form of a proto-oncogene.
C)   a bacterial gene that causes cancer in the host.
D)   always seen in human cancer cells.
E)   a gene that turns off cellular reproduction.F) A) and D)
G) None of the above

Question 7

Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Accepted Answer

A)   ribosomal RNA
B)   transfer RNA
C)   messenger RNA
D)   primary mRNA transcript
E)   ribozymesF) B) and D)
G) C) and D)

Question 8

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 mRNAF) A) and D)
G) A) and E)

Question 9

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.F) C) and D)
G) A) and D)

Question 10

Which is NOT associated with cancer?

Accepted Answer

A)   It can establish new tumors distant from the site of the primary tumor.
B)   It forms new blood vessels and brings nutrients and oxygen to the tumor.
C)   Cancer cells can undergo cell division repeatedly and indefinitely.
D)   Tumors invade surrounding tissues and are filtered by lymph nodes.
E)   A malignant mass of cells is encapsulated and does not invade adjacent tissue.F) D) and E)
G) All of the above

Question 11

The amount of adenine is always equal to the amount of ____ in DNA.

Accepted Answer

A)   cytosine
B)   uracil
C)   guanine
D)   thymine
E)   ATPF) B) and C)
G) C) and E)

Question 12

A cell of the pancreas would specialize in producing insulin,among other functions,while a muscle cell would specialize in the production of the protein myosin,this means that

Accepted Answer

A)   Pancreas and muscle cells have the genes for both insulin and myosin active.
B)   The active gene in pancreas cells is the one for insulin while the muscle cells have genes for insulin and myosin.
C)   Pancreas cells have a gene that would produce insulin while muscle cells have a gene that would produce myosin.
D)   Neither pancreas cells nor muscle cells are specialized.
E)   Only muscle cells can produce proteins.F) C) and D)
G) B) and C)

Question 13

Which of the following is NOT true about DNA?

Accepted Answer

A)   has a double helix
B)   bases held together by hydrogen bonds
C)   bases are complementary to each other
D)   has a deoxyribose sugar
E)   contains adenine, guanine, cytosine, and uracilF) A) and E)
G) A) and D)

Question 14

The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.

Accepted Answer

A)   helicase
B)   polymerase
C)   ligase
D)   extendase
E)   windaseF) B) and E)
G) A) and C)

Question 15

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

Accepted Answer

A)   protein  →\rarr→ RNA  →\rarr→ DNA.
B)   DNA  →\rarr→  RNA →\rarr→  protein.
C)   DNA  →\rarr→ protein  →\rarr→  RNA.
D)   RNA →\rarr→ DNA  →\rarr→  protein.
E)   RNA   →\rarr→   protein   →\rarr→   DNA. F) All of the above
G) None of the above

Question 16

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.F) A) and E)
G) B) and D)

Question 17

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.F) None of the above
G) A) and B)

Question 18

The individual(s) credited with the discovery of the structure of DNA is (are)

Accepted Answer

A)   Alfred Hershey and Martha Chase.
B)   James Watson and Francis Crick.
C)   Erwin Chargaff.
D)   Rosalind Franklin and Maurice Wilkins.
E)   Charles Darwin and Gregor Mendel.F) C) and E)
G) A) and C)

Question 19

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.F) D) and E)
G) C) and E)

Question 20

Which of these is NOT a form of a point mutation?

Accepted Answer

A)   nonsense mutation
B)   missense mutation
C)   silent mutation
D)   frameshift mutation
E)   UAC becomes UAUF) All of the above
G) A) and D)

Exam 25: DNA Structure and Gene Expression

The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.

Correct AnswerverifiedShow Answer

Tumor suppressor genes are

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Which of the following is NOT true about cancer cells?

Correct AnswerverifiedShow Answer

Which does NOT describe a function of the DNA polymerase molecule?

Correct AnswerverifiedShow Answer

Prior to protein synthesis,the DNA

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is NOT associated with cancer?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is NOT true about RNA?

Correct AnswerverifiedShow Answer

The individual(s) credited with the discovery of the structure of DNA is (are)

Correct AnswerverifiedShow Answer

Which of the following is NOT true about DNA?

Correct AnswerverifiedShow Answer

Which of these is NOT a form of a point mutation?

Correct AnswerverifiedShow Answer

Which of the following is NOT true about oncogenes?

Correct AnswerverifiedShow Answer

Which is NOT true about the genetic code?

Correct AnswerverifiedShow Answer

A cell of the pancreas would specialize in producing insulin,among other functions,while a muscle cell would specialize in the production of the protein myosin,this means that

Correct AnswerverifiedShow Answer

Which is the process that synthesizes mRNA?

Correct AnswerverifiedShow Answer

An oncogene is

Correct AnswerverifiedShow Answer

The amount of adenine is always equal to the amount of ____ in DNA.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Correct AnswerverifiedShow Answer

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