Question 1

Which of the following contains the anticodon?

Accepted Answer

A)   rRNA
B)   tRNA
C)   mRNA
D)   DNA
E)   protein

Question 2

Which of the following enzyme is needed to reseal breaks in the sugar-phosphate backbone during replication?

Accepted Answer

A)   DNA polymerase
B)   RNA polymerase
C)   RNA ligase
D)   helicase
E)   DNA ligase

Question 3

What is the hereditary material found in all cells?

Accepted Answer

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

Question 4

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)   GTA

Question 5

The protein derived from a particular gene is different when it is found in a neuron than in a muscle cell. This is most likely due to

Accepted Answer

A)   alternative mRNA processing.
B)   regulation of mRNA translation.
C)   alteration of protein activity.
D)   mRNA editing.
E)   DNA excision.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

The stages of translation are

Accepted Answer

A)   transcription, mRNA processing, and termination.
B)   DNA replication, transcription, and termination.
C)   initiation, transcription, elongation cycle, and termination.
D)   initiation, elongation cycle, and termination.
E)   initiation, transcription, mRNA processing, and termination.

Question 8

The two DNA strands must be separated before DNA replication or transcription can occur.

Accepted Answer

A) True 
 B)False

Question 9

During the elongation cycle of translation, the A site on a ribosome functions in

Accepted Answer

A)   receiving a new tRNA with the correct amino acid.
B)   holding the growing polypeptide chain as amino acids are added.
C)   attaching the small subunits of rRNA to the large subunit.
D)   releasing the completed polypeptide.
E)   processing the rRNA.

Question 10

If an organism's DNA contains 30% adenine nucleotides, what percentage of its DNA is composed of guanine nucleotides?

Accepted Answer

A)   10%
B)   15%
C)   20%
D)   30%
E)   40%

Question 11

Signal transduction pathways can stimulate transcription activators.

Accepted Answer

A) True 
 B)False

Question 12

Heterochromatin differs from euchromatin in that heterochromatin

Accepted Answer

A)   is transcriptionally active, whereas euchromatin is not.
B)   is not found in Barr bodies.
C)   is transcriptionally inactive.
D)   is the result of the unpacking of euchromatin.
E)   contains DNA with accessible promoters.

Question 13

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.

Question 14

If an organism's DNA contains 30% adenine nucleotides, what percentage of its DNA is composed of thymine nucleotides?

Accepted Answer

A)   10%
B)   15%
C)   20%
D)   30%
E)   40% D

Question 15

Which of the following series of events are in the correct order?

Accepted Answer

A)   chemical binds to receptor, signal transduction pathway stimulates transcription activator, target gene is transcribed and translated
B)   signal transduction pathway stimulates receptor, transcription activator is activated by target gene
C)   chemical binds to receptor, target gene is transcribed and translated, signal transduction pathway stimulates proteins that bring about desired changes
D)   signal transduction pathway activates receptor, chemical binds to receptor, target gene stimulates transcription activator
E)   chemical binds to receptor, signal transduction pathway stimulates target gene, target gene stimulates transcription activator

Question 16

According to Chargaff's data, ________ must pair with ________, and ________ must pair with ________.

Accepted Answer

A)   A; G; T; C
B)   A; T; C; G
C)   A; C; G; T
D)   C; T; G; A
E)   G; U; A; C

Question 17

RNA differs from DNA because RNA

Accepted Answer

A)   is double-stranded, whereas DNA is not.
B)   is single-stranded, whereas DNA is double-stranded.
C)   is never single-stranded, whereas DNA may or may not be.
D)   can self-replicate, whereas DNA replication requires enzymes.
E)   is replicated along with DNA but does not require strand separation like DNA.

Question 18

If an organism's DNA contains 33% adenine nucleotides and 17% 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%

Question 19

A defect in DNA ligase would most likely result in

Accepted Answer

A)   normal replication, but gaps remaining in the sugar-phosphate DNA backbone.
B)   failure to remove introns from the primary mRNA.
C)   incompletely processed primary mRNA that does not get translated properly.
D)   translation initiating normally but failing to proceed to elongation.
E)   DNA strands separating normally but failing to join nucleotides in the growing nucleotide chain. A

Question 20

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; rRNA B

Exam 11: Dna Biology

Which of the following contains the anticodon?

Correct AnswerverifiedShow Answer

Which of the following enzyme is needed to reseal breaks in the sugar-phosphate backbone during replication?

Correct AnswerverifiedShow Answer

What is the hereditary material found in all cells?

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

The protein derived from a particular gene is different when it is found in a neuron than in a muscle cell. This is most likely due to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The stages of translation are

Correct AnswerverifiedShow Answer

The two DNA strands must be separated before DNA replication or transcription can occur.

Correct AnswerverifiedShow Answer

During the elongation cycle of translation, the A site on a ribosome functions in

Correct AnswerverifiedShow Answer

If an organism's DNA contains 30% adenine nucleotides, what percentage of its DNA is composed of guanine nucleotides?

Correct AnswerverifiedShow Answer

Signal transduction pathways can stimulate transcription activators.

Correct AnswerverifiedShow Answer

Heterochromatin differs from euchromatin in that heterochromatin

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If an organism's DNA contains 30% adenine nucleotides, what percentage of its DNA is composed of thymine nucleotides?

Correct AnswerverifiedD

Which of the following series of events are in the correct order?

Correct AnswerverifiedShow Answer

According to Chargaff's data, ________ must pair with ________, and ________ must pair with ________.

Correct AnswerverifiedShow Answer

RNA differs from DNA because RNA

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A defect in DNA ligase would most likely result in

Correct AnswerverifiedA

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

Correct AnswerverifiedB

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D

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According to Chargaff's data, must pair with , and must pair with .

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A

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

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B