Question 1

If the maternal X chromosome is inactive and seen as Barr body in one cell,then it is the maternal X chromosome that is inactive and seen as a Barr body in every cell of that woman's body.

Accepted Answer

A) True 
 B)False  False

Question 2

Prokaryotes regulate gene expression with a promoter.

Accepted Answer

A) True 
 B)False

Question 3

Which base is found in DNA,but not in RNA?

Accepted Answer

A)   cytosine
B)   uracil
C)   thymine
D)   adenine
E)   guanineF) B) and D)
G) A) and B)

Question 4

Which of the DNA sequences shown in the figure is/are bound by a regulatory protein?

Accepted Answer

A)   1
B)   2
C)   3
D)   1 and 4
E)   2 and 3F) C) and D)
G) None of the above

Question 5

tRNAs carrying the correct amino acid recognize the proper codons on the mRNA because

Accepted Answer

A)   the anticodon of the tRNA hydrogen binds to the codon of the mRNA by complementary base pairing.
B)   the codon of the tRNA binds to the anticodon of the ribosome by complementary base pairing.
C)   the anticodon of the tRNA carries the correct amino acid.
D)   the amino acid binds to the anticodon of the mRNA and brings the correct tRNA with it.
E)   the codon of the mRNA binds the correct amino acid, and the tRNA stabilizes this interaction.F) All of the above
G) None of the above

Question 6

Transcription activators are different from transcription factors in that

Accepted Answer

A)   transcription activators are required for RNA polymerase binding, while transcription factors slow RNA polymerase binding.
B)   transcription activators accelerate transcription, while transcription factors assist RNA polymerase binding.
C)   transcription activators slow transcription, while transcription factors accelerate transcription.
D)   transcription factors prevent RNA polymerase binding, while transcription activators assist RNA polymerase binding.
E)   transcription factors are required for RNA polymerase binding, while transcription activators accelerate transcription.F) D) and E)
G) C) and D)

Question 7

During translation,initiation occurs normally,but elongation fails to occur.Which process is mostly likely faulty?

Accepted Answer

A)   translocation of ribosome
B)   binding of tRNA-methionine to start codon
C)   association of the small and large ribosomal subunits
D)   processing of primary mRNA
E)   joining of nucleotidesF) B) and E)
G) A) and C)

Question 8

Figure: 
-The sequence of the peptide that would result from transcribing and translating the gene pictured would be

Accepted Answer

A)   Tyr-Ala-Asn.
B)   Ile-Ser-Val.
C)   no peptide would be made, the first codon means "stop."
D)   Met-Arg-Leu.
E)   Tyr-Ser-Val.F) A) and E)
G) C) and D)

Question 9

DNA replication makes a(n) ____ copy of the DNA strand,while transcription makes a(n) ____ copy of the DNA strand.

Accepted Answer

A)   mRNA; DNA
B)   DNA; mRNA
C)   DNA; tRNA
D)   mRNA; tRNA
E)   mRNA; rRNAF) A) and D)
G) A) and B)

Question 10

mRNA must be processed in the cytoplasm before being used in protein synthesis.

Accepted Answer

A) True 
 B)False

Question 11

If RNA polymerase malfunctions

Accepted Answer

A)   one of the subunits of rRNA will not be transcribed from DNA.
B)   amino acids will not be joined to their tRNA.
C)   mRNA cannot bind to rRNA.
D)   an mRNA will not be formed.
E)   mRNA cannot copy itself.F) A) and B)
G) B) and E)

Question 12

Signal transduction pathways can stimulate transcription activators.

Accepted Answer

A) True 
 B)False

Question 13

Which process requires the participation of all three types of RNA?

Accepted Answer

A)   transcription
B)   translation
C)   RNA processing
D)   replication
E)   complementary base pairingF) A) and E)
G) All of the above

Question 14

If an organism's DNA contains 17% adenine nucleotides and 33% guanine nucleotides,what percentage of its DNA is composed of cytosine nucleotides?

Accepted Answer

A)   8.5%
B)   17%
C)   25%
D)   33%
E)   50%F) C) and E)
G) C) and D) D

Question 15

The x-ray diffraction pattern of DNA discovered by Rosalind Franklin showed that DNA

Accepted Answer

A)   is helical.
B)   has a repeated pattern.
C)   is both helical and has a repeated pattern.
D)   contains beta sheets arranged in a repeated pattern.
E)   contains alpha helices and beta sheets.F) C) and D)
G) A) and B)

Question 16

Histone displacement is necessary for transcription to occur in euchromatin.

Accepted Answer

A) True 
 B)False

Question 17

The central dogma of molecular biology states that the information contained within genes flows in which direction?

Accepted Answer

A)   DNA to DNA to protein
B)   mRNA to DNA to protein
C)   DNA to mRNA to protein
D)   DNA to tRNA to mRNA to protein
E)   DNA to rRNA to proteinF) B) and E)
G) A) and E)

Question 18

Which of the following allows a cell to decipher the genetic code?

Accepted Answer

A)   rRNA
B)   tRNA
C)   mRNA
D)   DNA
E)   proteinF) B) and E)
G) A) and B) B

Question 19

In eukaryotes,one gene may specify the construction of several proteins.

Accepted Answer

A) True 
 B)False

Question 20

For a DNA strand that contains the sequence AGT in the 5' to 3' direction,what nucleotides are found on the other DNA strand in the 5' to 3' direction?

Accepted Answer

A)   ACT
B)   TGA
C)   AGT
D)   TCA
E)   GTAF) D) and E)
G) A) and B)

Exam 11: DNA Biology

If the maternal X chromosome is inactive and seen as Barr body in one cell,then it is the maternal X chromosome that is inactive and seen as a Barr body in every cell of that woman's body.

Correct AnswerverifiedFalse

Prokaryotes regulate gene expression with a promoter.

Correct AnswerverifiedShow Answer

Which base is found in DNA,but not in RNA?

Correct AnswerverifiedShow Answer

Which of the DNA sequences shown in the figure is/are bound by a regulatory protein?

Correct AnswerverifiedShow Answer

tRNAs carrying the correct amino acid recognize the proper codons on the mRNA because

Correct AnswerverifiedShow Answer

Transcription activators are different from transcription factors in that

Correct AnswerverifiedShow Answer

During translation,initiation occurs normally,but elongation fails to occur.Which process is mostly likely faulty?

Correct AnswerverifiedShow Answer

Figure: -The sequence of the peptide that would result from transcribing and translating the gene pictured would be

Correct AnswerverifiedShow Answer

DNA replication makes a(n) ____ copy of the DNA strand,while transcription makes a(n) ____ copy of the DNA strand.

Correct AnswerverifiedShow Answer

mRNA must be processed in the cytoplasm before being used in protein synthesis.

Correct AnswerverifiedShow Answer

If RNA polymerase malfunctions

Correct AnswerverifiedShow Answer

Signal transduction pathways can stimulate transcription activators.

Correct AnswerverifiedShow Answer

Which process requires the participation of all three types of RNA?

Correct AnswerverifiedShow Answer

If an organism's DNA contains 17% adenine nucleotides and 33% guanine nucleotides,what percentage of its DNA is composed of cytosine nucleotides?

Correct AnswerverifiedD

The x-ray diffraction pattern of DNA discovered by Rosalind Franklin showed that DNA

Correct AnswerverifiedShow Answer

Histone displacement is necessary for transcription to occur in euchromatin.

Correct AnswerverifiedShow Answer

The central dogma of molecular biology states that the information contained within genes flows in which direction?

Correct AnswerverifiedShow Answer

Which of the following allows a cell to decipher the genetic code?

Correct AnswerverifiedB

In eukaryotes,one gene may specify the construction of several proteins.

Correct AnswerverifiedShow Answer

For a DNA strand that contains the sequence AGT in the 5' to 3' direction,what nucleotides are found on the other DNA strand in the 5' to 3' direction?

Correct AnswerverifiedShow Answer

Correct Answer
verified
False

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

DNA replication makes a(n) copy of the DNA strand,while transcription makes a(n) copy of the DNA strand.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified